Sure, now get a date, connect with old friends, get invited to a party or join your children's school parent groups exclusively on free software.
>And a phone IS a computer, so why pretend it's not?
I agree we shouldn't, I'm just saying that it's unlikely for that need to meet a large enough demand.
You might consider Instagram, whatsapp or similar apps personally not essential, but for many (I would say most) people they are - if not truly essential for living, at least essential in the sense that they don't have much use for their phone outside of those apps.
Which was my point, as long as the main use of a phone requires passing through meta's (or whoever else's) hoops, it's going to be a hard battle.
The only minimally mainstream uses of a phone that currently lie outside the walled garden are piracy and emulators, and that's already a stretch.