Your arbitrary, loosely-detailed complaints would apply to literally everyone, every app.

It's on f-droid, it's open source, you're being ridiculous. I'm not even sure you understand what you're asking for. The official, open source Tailscale client explicitly supports headscale servers.

It's the only app from the ones I use that my friends and relatives who already use iOS can't even install due to geoblocking.

If you don't see it as a problem means you're not affected and perhaps lack some empathy.

Yes, I understand the Apple ecosystem is a problem. But it's not an insurmountable one. Builds of Free Software exist on Apple Appstore and none of them exhibit this problem, unless they are tied to a commercial entity in the corresponding jurisdiction. The issue with Tailscale is that they use their open-source clients and headscale as means to gain user trust, but their solution is deficient due to everything mentioned above.

> I'm not even sure you understand what you're asking for.

I'm asking for a free software client to go with the headscale server that can be installed everywhere technically viable, without idiotic additional restrictions.

It's clear that it's you who don't really understand the crux of the issue (which you partially admitted by you "not even sure", but still), but it's somehow I who's ridiculous.