Because it's a pain in the ass and people don't care enough to. People don't want the fediverse, they want an app. They don't want to know about cloud and infra primitives, they want their photos in their phone and for them to be safe and shareable. They want their iMessages and WhatsApp to JustWork(TM).
> How can we make more people self host their data rather than giving it to corporations?
You cannot. Make non profits to manage this infra. Wikipedia, Lets Encrypt, etc. Hacker News is a benevolent dictatorship funded by a VC fund and run by someone passionate about the work. Incorporate a 501c3, spin up a deposit account, and start sourcing donations and funding to pay for infra and people.
This is not a doomer comment. Enable the power admins and passionate folks to deliver a great experience to normies with as little effort as possible. Literally how Wikipedia functions: datacenter, paid admins, passionate volunteers curating bytes.
(Would be cool if Cloudflare supported one click deploy of Fediverse tools into their edge cloud; scale when you need, get your data out of R2 and databases on demand so you're not locked in; having to pay for infra is inevitable, that is to be solved for)