All of these are the responsibility of the developer.
The ability to deep link in Flash has been around for years, made easier in the last three by swfaddress.
Dynamic font sizing is achievable but I can't remember one Flash enabled site that does it. There are of course accessibility advantages Flash has, like the ability to detect active screen readers.
Being able to select text in Flash is controlled by a property, again set by the developer.Not exactly a like for...