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It's never been a better time to switch to Firefox
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
from what i understand, it's possible to re-lock the bootloader and use some kind of security patch to be able to do that. it's definetely possible.
unfortunately not all custom ROM are able to relock. You can off course use Magisk with Sygisk and then you can use your costum rom phone for bankig apps and google wallet. I am using one myself - https://lineageos.org/