Honestly that’s a feature not a bug

https://www.theguardian.com/technology/2017/oct/05/smartphone-addiction-silicon-valley-dystopia

Unlikely as its ios

Not really unless you want a potato from 2008

Short answer: phone manufactures hate you

Long(ish) answer: Each phone manufacture heavy modifies the linux android kernel in order to make it work on there hardware. This usually means that the binary blobs (there are a lot of them) are only compatible with specific kernels.

Is it on F-droid?

I think we need more choice. The problem is modern hardware forces proprietary blobs