fletchy

WhatsApp support wasn't dropped...
you can still forward an audio using workflow (or any other app in the share sheet)
the problem is the file, is only playable on VLC since it's an opus file...
before 2016, WhatsApp audio files were playable because they were aac...

you can also send any file through workflow using WhatsApp, which is also supported which means workflow did NOT stop support for workflow...

on the other hand, google chrome, street view, Uber, pocket and some others are no longer supporter because as Marco Arment specified, previous to the acquisition news, devs were sent a one page permission to sign in order to keep their app supported by workflow (something Apple always does to protect its back) which he (Arment) did...

And chances are, companies like google, Uber and pocket didn't bother to do so...

but considering WhatsApp is still supported as much as it was before, not more nor less, it means they did sign the agreement...