I feel bad for them too, but that's why people who have been around since the early internet were against this "running your business on another businesses property" model. Sure, it made it easier to get eyes on your products, but you're always at the mercy of changing business models from the owner or the business failing.

Like, if Twitter just went bankrupt today and everything was sold off and servers shut down, I would feel bad for them, but they literally made the choice to bank their entire careers on the private property of someone else.

When it comes to a business with a physical presence this can be a lot harder, because you're almost always stuck leasing a spot, and are rarely lucky enough to own the property you're running your business on. This fact is a huge reason why most small businesses fail in the first five years, because the costs of running your business on someone else's property are insanely high and leave for thin margins on profit.

Sure a website isn't free, but it's a lot less costly than a physical business space. It's more costly than a Twitter profile, but the stability of knowing you can count on your site is a lot different. Just make sure you're self-hosting or signing up with a hosting provider who won't disappear overnight, because going with a hosting provider runs some of the same risks, although fewer since "hosting" is their business, whereas Twitter isn't directly in the business of promoting creators. Hosting providers have a little more incentive to not change things to fuck over their customers, just barely though.