Updated 28-Jun-2024
I have not played with Mobian (yet), but it, and two other projects (Termux and UserLAnd), are quite promising. The biggest issue seems to be hardware at this point, as there are only Pine Phone and Tab, and Purism Librum, as well as one or two other devices are supported. That said, the Mobian project aims to have multiple people on each device and to overall work so that there are no single points of failure for the project.