Australia

Fair, I also didn't realize that I was replying in an Aussie specific community, so this part:

but there was literally a law saying all platforms must be responsible for every single comment on their platform and several of them said they would turn off comments.

makes it make more sense to me why you said that in your original comment. Over here (US) there is very little regulation of these platforms. Basically, they can't knowingly host CSAM, and they have to respond to DMCA requests. The DCMA is basically just "take down copyrighted material when a right's holder complains." We have a carve out called section 230 that really lets companies not have much responsibility for the content they host. So in the US's case when it comes to these things going back to the hot dog analogy, our tech companies only responsibility is along the lines of not explicitly encouraging employees to allow rodents, or even to police for rodents, it's basically just if the right people report rodents they have to do something about it.

So in the case of YouTube, for example, I and most other people who know how to build websites can make a site that hosts video fairly easily. Because regs here are so lax, all I really need to do is explicitly state that CSAM/copyright materials aren't allowed, do a shockingly small amount of work to automatically take it down when reported. Laws over here aren't really the barrier.