Sorry if I come off like a butthole but I'm both curious yet dubious of the idea. I feel like people probably have thought about it but they probably ran into the same problems you'll run into.
You didn't quite answer my question. Where are you getting revenue? Eg. Subscription, one-time fees for X, grants, investments, etc?
Duallingo started like a non-profit but even their revenue with its massive userbase couldn't cover their expenses so they had to compromise hard to keep the lights on. The same happened to Coffee Meets Bagel. Hinge started with the same premise of "this app is meant to be deleted" but they also had to compromise and eventually sold to Match Group.
Also, I feel like gay men are a unique demographic that has higher that average engagement so Grindr is probably in a uniquely advantaged position to resist enshitification.
I guess I'm just saying it's probably in practice a cost center like city infrastructure or schools or research, so it might only work without heavy compromises if it's also funded by taxes.
Donations and many self hosted volunteers, helped by the unique nature of the fediverse architecture also distributing burdens, fewer users, and lower computation/storage/availability requirements (compared to a more centralized service like a dating app).