There is already a Foss mobile OS, it's called Android, or more specifically a distribution of it like LineageOS. But installing it is so difficult that only 1% of people have the technical know how to even attempt it, and it's getting more difficult as manufacturers introduce more and more hurdles in this process.
Which is all irrelevant anyway because the vast majority of people done even realise that everything they see, do, or type on their phones is reported to hundreds of companies, processed, and te-sold to thousands of companies all over the world.
We need regulation, full stop.
