And normal people can't get on the winning side. I'm trying to get Github to DMCA my own repositories, since it blocked my account and therefore I decided it no longer has the right to host them. Same with Stack Exchange.

GitHub's ignored me so far, and Stack Exchange explicitly said no (then I sent them an even broader legal request under GDPR)

When you uploaded your code to GitHub you granted them a license to host it. You can’t use DMCA against someone who’s operating within the parameters of the license you granted them.