But I think Sailfish OS has a mature ecosystem, they are well recognized in the EU and based on GNU/Linux. I use it daily, after moving from UBports, and it serves me well. Hopefully SfOS gains more popularity.
By which criterion? I'm happily using Librem 5 as a daily driver; wrote this reply from it.
For the new ecosystem to win, it needs to have its own user base for companies building apps to recognize it. Even with SailfishOS, the banking apps still require Android compatibility layer, which is slowly eroded with Play Services and Play integrity check disabling those one by one in the coming years.
I would say that this is really not the OS's problem, but the bank's problem. I find it absolutely intolerable that there are banks that force me to use a OS from one (or two) specific vendors.
Same goes for public transportation services (German Bahn Card is now only available in their app) or post mail services (German Post "Mobile Stamp" is only available in their official app).
A person can dream.
Created a hobby OS, just a hobby, won't be big
…And strong and effective antitrust legislation in place to stop current monopolies like Google from crushing small startups.
Trouble is, despite governments paying lip service to wanting competition in this arena they really don't want competition at all, especially so from small startups.
Look at it this way, controlling and handling a few big companies is much easier for governments than having to deal with a plethora especially so when many are small startups; and second, it's also easier for them to extract user data from Big Tech's operations (as Big Tech is predictable and they've been doing so for a long time)—than it it would be from many small startups, especially so when the products they're planning to manufacture are aimed at improving privacy and adding encryption.
Think of the current UK and Apple debacle and governments' motives for not being proactive become abundantly clear.
Technically not as long as the fallback PDF version remains available.
They are all impressive tech, but not actual stuff you can sell or distribute until you can answer those questions.