What we see is the logical extension of what's required for continuation of the copyright system: a highly regulated Internet where nothing can be published unless its copyright status has been accurately identified. Only authorized people can be relied on to produce new content, otherwise there's no way to tell if they just copied it from someone else.
The next step would be to shut down proxies, systems such as Tor, and connections to sites in rogue states that don't sufficiently enforce copyright.
Funny many years back I had a friend who worked at a company that builds a widely successful proprietary OS that tried to lock down the OS from any unauthorized software, aka solving the issues with copyright / piracy forever so to speak. They figured it's not their battle to fight and scrapped the project. It's just not a battle worth fighting. Look at Steam... Sure people still crack Steam games... but many more so buy Steam games.
I think they would need to shut down encryption too, because one logical outcome to avoiding copyright checks is encrypting the content on the client so the provider don't know what has been uploaded.
The provider could still be held liable if the decryption keys became public. The argument would just be that they "should have known better" than to "publish" data that they couldn't examine.
and the shutdown of basically any kind of public forum on a small site since it is going to be nearly impossible for small entities to comply with regulations.
Legally, perhaps it could be sufficient to include a check box saying "I certify that I am the copyright holder to everything I upload". Compare with the way EU handles the cookie law and GDPR consent click-yes.
You're joking here, but a politician in Poland, when asked about how shall a popular link sharing platform (wykop.pl) deal with submissions, of which there are 100k / hour in peak times, actually suggested that "users should know not to upload illegal materials".
The last sentence threw me off (about certain content not being covered). If it was just your first paragraph, I would have thought it was sarcasm. And I was tired.
The next step would be to shut down proxies, systems such as Tor, and connections to sites in rogue states that don't sufficiently enforce copyright.