SailfishOS

It would be amazing if one day I could treat my phone same way as I treat my PC with the freedom to install just any OS without being penalized so heavily (e.g. by some banks with their mandatory MFA solution) but before that becomes a reality I think some transitory work is needed and SailfishOS[1] seems to be it.

SailfishOS has closed source UI components and uses licensing vocab on their front page. Nevertheless it is linux based, is an independent OS, and is not Android but has a compatibility layer for running some Android apps. With some focus on marketing and finance it makes me more confident on their survival while rivaling Google & Apple. Otherwise the "product" doesn't grow beyond tinkerers circle.

I have doubts too though, Android was the same: Started as open source but added more & more of licensing and look at it now.

[1]: https://sailfishos.org/
[1]: https://wiki.postmarketos.org/wiki/Category:Sailfish