It's likely Cloudflare related. Some of the larger instances are behind that, but many of the smaller ones aren't. Cloudflare isn't only a problem for VPN users, so its a good idea to avoid those instances as a user. You can still interact with their communities via Federation.
No, they found some billionaires to do it 😉
There is also Google maps integration. Sure, it's not mandatory anymore, but if you install the official Signal app on a phone with Google play services installed, you are effectively not running an open-source app anymore and this potential backdoor is also not noticeable with reproducible builds.
F-droid has strict rules in place to prevent these sort of things for good reasons, thus the original comment is not entirely wrong in saying that an app that claims to be open-source, but can't be made available on F-droid is a red-flag.
The external Google dependencies I am talking about are loaded into the client not the server, so that's an entirely different issue.
I'll leave it up to you to decide if that is bad or not, but one of the reasons the Signal app can't be put unaltered on F-droid is because it loads in external dependencies from Google at run-time, which can also be altered by Google at will with any Android update.
The goal is to promote a local market. Not much point to have a marketplace with used items from the other side of the world.
Although manual curation of the connected instances would also work for a specialist marketplace where you can only find specific types of items.
I think both use-cases make more sense than general marketplace with mostly irrelevant entries.
I got a Fairphone 5 and will probably try to use it with Mobian once that becomes available for it.
Sort of, but no. Ubuntu Touch uses libhybris to run the original Android kernel and device drivers. It's a bit more complicated than that, but basically it is Android with a more Gnu/Linux like layer on top. This means you can run it on older hardware and the top-layer still gets some security updates, but for the most part you are stuck on the old Android parts with all the security issues.
That was why I added "basically". Yes, theoretically that option exists, but practically you can't realistically run anything in a usable way with that.
Yes, I have used Ubuntu Touch as a daily driver for two years and even developed some apps for it.
There is https://hypersomnia.xyz/ but it is 2D top down. Pretty tactical though.