Even in that case, you'd have to deal with every hosting provider which, at the very least, would require an actual legal DMCA request rather than an automated

Even in that case, you'd have to deal with every hosting provider which, at the very least, would require an actual legal DMCA request rather than an automated one and, since people would be able to self-host, a way to contact their ISP who would have to verify that the claim and request are even valid. With YouTube, the automation is what's killing content creators and the archival value of the platform.