Are you confusing the DMCA safe harbor process with first party distribution of copyrighted material? I'm not an IP maximalist or anything but what you're saying is straightforwardly not the process for distribution of copyrighted material.

It is not actually the case that I can legally distribute whatever I like so long as I stop when asked. These are US orgs so assuming US law here.

Since you ask for specifics, this part is wrong:

> Rebble clearly honors copyright, ex: removing apps on request of the author. Thst's the only right any copyright holder ever has is to say you can't redistribute copies.

No. A rights holder can request that you pay for the distribution you already did. You'd then force litigation and it would cost the rights holder a lot for very little gain. Showing harm here would be hard so they don't do it but what you're saying is so far from correct it's unclear why you are insisting on specifics. It's not nuanced.