Generally, because I think all server-centric AP software is broken and I want to see a client-first application to browse the social web.
Particularly in relation to piefed: it seems to be focused on the exact opposite (giving more power to the server admins) and it takes a good page of social engineering / "nudge theory" principles to guide its design. Much like Mastodon, it seems to be strongly opinionated about how people should behave and it kinda gives me an icky feeling about its culture.