There’s also Flare fwiw:

https://flathub.org/apps/de.schmidhuberj.Flare

MicroOS (and its flavors) update the same way Android does; as a full image

They don’t. They update with regular packages. The updates are atomic though and are only applied at next boot, so there’s less of a risk of weird breakages.

This is the best FOSS keyboard that’s under active maintenance.

I assume that might be a reference to FlorisBoard? Because development on that one as actually picked up again, but that’s only visible so far if you’re using the Beta version. They’re opreparing for a new full release.

A lot of the mainstream apps definitely have privacy issues. They often sell data about their users menstrual cycles which can theoretically be bought by anti-abortion activists/authorities on the free market to track whether someone might be pregnant.

StreetComplete and its expert editions are definitely my favourite way to contribute to OpenStreetMaps on mobile. There’s also Vespucci which allows you to do more complex stuff like add paths and shape, but the UI isn’t super great imo. Organic Maps which I use for navigation actually allows you to edit and contribute quite a bit.