Removing by ADB is fine if you are able to identify which packages should be removed or if they're already covered by Universal Debloater. You should also use Invizible Pro to control what connections are made and block trackers.
It's unclear to me how these torrents are used. If individual books are not downloaded from them, is this only to make it possible to create similar sites in the future, in case this one is taken down?
It isn't a system app for my phone, so maybe. You could still use something like InviziblePro or RethinkDNS to disable its internet access without root though.
Remove Google apps as part of the debloat process, restrict permissions beyond what Android allows by default for all system apps, using App Ops and Shizuku. Accomplishes the same thing as GrapheneOS.
You can make stock Android much more private. Universal debloat tool + Invisible Pro - remove unnecessary apps, restrict internet access to only the apps you want to have internet access, add a tracker blocker list.
Oh. I think the amount of people that are afraid of specific breeds is much smaller than the internet would lead you to believe. I'd definitely pet her!
Removing by ADB is fine if you are able to identify which packages should be removed or if they're already covered by Universal Debloater. You should also use Invizible Pro to control what connections are made and block trackers.