Self-hosting, certainly (to a degree anyway). But the Fediverse isn't self-hosted. I'm not keeping a catalog of comments on my computer that you lose access to when I close my laptop.

Self-hosting also tends to require dedicated hardware. Less of a big deal as the real cost of your own personal little server setup has plummeted. But still something that's predicated on always-on internet connectivity in a way that's not always practical.