I've reached the same conclusion.
All data is just bits. Numbers. Once it's out there, trying to control their spread and use is just delusional. People should just stop sharing things publicly. Even things like AGPLv3 are proving to be ineffective against their exploitation.
I really didn't expect to live in this "copyright for me, not for thee" world. The same corporations that compare us mere mortals to high seas pirates when we infringe their copyrights are now getting caught shamelessly AI laundering the copyrights of others on an industrial scale.
It's so demoralizing. I feel like giving up and just going private. Problem is I also want to share the things I made. To talk about my projects with real people. Programming is lonely enough as it is. Without sharing I'm not sure what the point even is. I have no idea what I'm supposed to do from now on. I just know I don't want to end up working for free to enrich trillion dollar corporations.