> whether ... the concept of "bad actors coming in and ruining it for everybody by taking without giving back" even makes sense.

This is pretty clearly answered by the GPL: yes, it does, and this concept has been around since the very beginning.

> The information is still there

True

> as is the community that you've built

Untrue. At this point it's well understood that AI is substitutionary for many of the services that would have once afforded people a way to monetize their production for the community. Without the ability to make a living by doing so, even a small one, people will be limited to doing only what they can in the little free time they get outside of work.

That's the whole problem -- that AI, as it exists today, is taking away from the public, and hurting it at the same time. That's closer to robbery than it is to "sharing in the community".