

I’m sure it’s in the terms and conditions, hence uploaders have no recourse. If not, it’s surely a violation of copyright, at least in the USA where copyright is automatically granted when a work is created.
One solution would be for people to stop uploading to Google platforms until this practice is halted and made opt-in, but that won’t happen. Too many people depend on YT to survive. And lots more desperately want to make it big there.
That is awesome.