For Linux distributions to be able to do all of these things with the T2, Apple would need to either open up access to it, or someone in the Linux community would need to reverse-engineer support for it. Neither of those things has happened. And given the age and relative obscurity of the T2 hardware, it doesn’t seem enormously likely at this point.
The T2 chip seems like it isn't really useful for Apple any more, and only serves to hinder giving the hardware our second life. Would it be a candidate for releasing the source and IP on, for many other company? I don't Apple ever would.