Scott Forstall told Pandora to jailbreak early iPhones to get a head start on development
Ahead of the official App Store SDK, Scott Forstall told Pandora to use jailbroken iPhones to develop their music app.

Pandora
Long before he left Apple, and has proven hard to track down, Scott Forstall promoted the then forthcoming App Store to developers. Music service Pandora's chief technology officer, Tom Conrad, says around 2007, that included advising them to start work early using jailbroken iPhones.
According to an interview in Vice, Conrad says that he and Pandora executive Tim Westergren were invited to lunch by then Apple senior vice president Scott Forstall. They met away from Apple, and reportedly talked for hours, before Conrad asked what Pandora should do next.
"What, if anything, can we do at Pandora to get ready for the next generation of iPhone that includes an App Store and native APIs?" Conrad asked
"Forstall said," reports Conrad, "[that] it wouldn't be a waste of your time to jailbreak some iPhones and use the kind of back door toolkits that were being distributed by other people to build a native Pandora app while we get our act together at Apple on something more formal."
Forstall's recommendation meant that Pandora was able to develop its app ahead of both the App Store, and of Apple's official App Store SDK. Consequently, its music app was available to on the launch day of the App Store.
According to Vice, nine months later, the Pandora app had been installed on 21% of iPhones.
Pandora most recently added Siri voice support for controlling the service via the HomePod and HomePod mini.

Pandora
Long before he left Apple, and has proven hard to track down, Scott Forstall promoted the then forthcoming App Store to developers. Music service Pandora's chief technology officer, Tom Conrad, says around 2007, that included advising them to start work early using jailbroken iPhones.
According to an interview in Vice, Conrad says that he and Pandora executive Tim Westergren were invited to lunch by then Apple senior vice president Scott Forstall. They met away from Apple, and reportedly talked for hours, before Conrad asked what Pandora should do next.
"What, if anything, can we do at Pandora to get ready for the next generation of iPhone that includes an App Store and native APIs?" Conrad asked
"Forstall said," reports Conrad, "[that] it wouldn't be a waste of your time to jailbreak some iPhones and use the kind of back door toolkits that were being distributed by other people to build a native Pandora app while we get our act together at Apple on something more formal."
Forstall's recommendation meant that Pandora was able to develop its app ahead of both the App Store, and of Apple's official App Store SDK. Consequently, its music app was available to on the launch day of the App Store.
According to Vice, nine months later, the Pandora app had been installed on 21% of iPhones.
Pandora most recently added Siri voice support for controlling the service via the HomePod and HomePod mini.

Comments
They do care as in it voids the warranty, and bypasses the App Store, they surely don't want it to be easy which is why they make it hard.
i don't think that there is a single person alive who has been afraid of being sued by apple for jailbreaking their own phone. jailbreak your phone... you lose your warranty. if your phone is so broken that you have to actually bring it to apple for repair then you're probably not going to be able to "install a valid OS again later" so the voided warranty is still the deterrent...
and the idea of an officially tolerated (not even supported... just "tolerated") "OtherOS" seems pointless. the A-series processors are so heavily customized from ARM that you'd never get the same performance or optimizations from a guest OS so it'd be easier and cheaper to just buy an Android / Windows / whatever device and get on with your life. At least with the Macs they were running off the shelf Intel processors so are almost instantly compatible with other operating systems.
That’s not entirely how it went.
If you look at the following Apple event, you can see Forestall in the audience just seething that they muzzled him and were counting the minutes before firing him.
(1) I highly doubt that anyone has physically damaged their iPhone by installing a different OS, so that's not a realistic situation you are describing. If you don't know how to restore iOS onto a corrupted device, just google it. It's not hard to find.
(2) "not as high performance" does not make something "pointless". To the contrary, if doing this gets regulators off Apple's back, because it lets users install any software they want, then having an alternate OS that runs inefficiently is the ENTIRE POINT. How ironic that you missed that point.
Providing it wasn't widely known, as it could have been seen as broad encouragement of jailbreaking, then there wasn't really a downside for Apple.
I see not a shred of evidence that Forstall's departure changed Apple's views on replacing an OS. And you offered no proof. All you did was rant about your opinions.
Chances are that he may write a tell-all sometime in the future, but I respect him for keeping mum, whatever the reasons may be.