I can only really speak to reddit, but I think this applies to all of the user generated content websites. The original premise, that everyone agreed to, was the site provides a space and some tools and users provide content to fill it. As information gets added, it becomes a valuable resource for everyone. Ads and other revenue streams become a necessary evil in all this, but overall directly support the core use case.
Now that content is being packaged into large language models to be either put behind a paywall or packed into other non-freely available services. Since they no longer seem interested in supporting the model we all agreed on, I see no reason to continue adding value and since they provided tools to remove content I may as well use them.
One of the things that makes the warp drive idea so compelling is it does not have this issue. I'm not a physicist but I do like star trek. The idea is that inside the "bubble" is a normal inertial frame with no significant time dilation effects compared to where you left from. This is why in fiction you can travel faster than the speed of light within one without the need for "infinite" energy. Your mass never moves in space, you take your little bubble of space with you.