In addition to that,

• I like the challenge of leaning new technologies and hosting my own web apps
• It lets me feel that I have a bit more control over my user and posts
• I get my own vanity domain / user address
• I get a good understanding of how the lemmy frontend, backend and database work (yay open-source!)
• I can keep my instance up to date with the latest lemmy releases (some are still running 0.17.3!)
• I can do some dev work and testing on my instance, if I want, without impacting others
• it reduces load on the main instances

There’s more, but I think that’s a good enough list for now. Have a nice day!