Fear, Uncertainty, and Doubt. FUD.

IIRC, no. You unlock the bootloader to install, re-lock, and enjoy your phone.

It should. My banking apps worked fine. None of them work on a rooted phone but worked absolutely fine on Graphene.

Linux Apache MySQL PHP https://en.wikipedia.org/wiki/LAMP_(software_bundle)

See also WAMP and MAMP. For windows and macOS

That’s a good one. I haven’t really looked into it much previously but I was able to find a few relatively easily.

Here is an example https://audibiliber.com/

There are more resources here https://ektseb.com/كتب-صوتية-مجانية/

You might need to use something like YT-DLP to download tho.

I might actually use something of these sources. This is great!