Nextcloud, I don’t want to be dependent on a third party for storage anymore. I don’t want to fear them going out of business, raising their prices or banning me because I store a file they don’t like.

Of course I also like messing with that kind of thing and being in control but those are not the main reason.

edit oh and I’m 100% through someone else hosting and messing with my calendar and contacts, which Nextcloud does fine for me.