We have decades of experience managing platforms and content.
As a billboard owner, I rent space to advertisers. They create the content, but I am responsible for what goes up because the billboards are mine. So, I have a process. Advertisers have to submit their content to me before I will have my people put it up. Simple, effective, legal.
I suppose that I could simply allow anyone to put their own content on my billboards as long as they pay me. It would save a step in my process. I could make more money because I could eliminate the review process. However, if they decide put up pornographic images or messages threatening the life of the President, I would and should get in trouble. It's my property after all and I allowed it to happen. I didn't know they were going to buy space on my property and espouse criminal activity" isn't and never has been an excuse.
Ditto for my newspaper, my TV station, radio station, and every other platform for advertising and communication that has ever existed.
That is until the Internet came along.
Computers make it so easy to automate every aspect of buying space, listing, and monetizing. So easy, in fact, that I designed my business process around allowing people to post up whatever content they want and paying me without even having to communicate with me, much less share their content or intent.
It's easy. Don't ask me why the Internet based communication is different. It just is. As the owner of a (Facebook/Google/Twitter/you name it) I don't have to care about how my platform is used. I'm protected. Mostly because lawyers and judges are some of the biggest Luddites in America and have no understanding of technology and can't see that my online platform is just that, a platform, exactly like my billboards, newspaper, TV and radio stations.
Better yet, they are so divorced from business operations that they don't understand the concept of process management. That's why when I tell them "I couldn't possibly monitor all of the content posted on my online platform", it's because I designed the process to not be able to monitor all of the content.
It's amazing to me that I can tell a judge "I cannot monitor all of the content posted on my platform because I designed the process in such a way that I wouldn't have to monitor all of the content posted on my platform."
Sure, I could redesign my process to eliminate unwanted content, but that would cost money and negatively impact the bottom line. People like Zuckerberg and Musk would be relegated to meager profits more in line with physical platforms.
I don't know how long I'm going to keep the legal system fooled, though. It seems that Netflix and HBO, and all of the other streaming content providers have to watch what they air. Of course that's probably because the streamers content appears on the television and lawyers and judges understand TV.