I subscribe to ones I'm interested in. But sometimes I browse all to stumble across new interesting communities. I block the ones I see repeatedly and aren't interested in. I block mass posters, I block bots, I block tankies, I block mods/admins of larger communities. It just makes my all browsing time more efficient.
I use it to curate my lemmy experiance. 99% of the users/communities I block aren't for anything personal, they're just clogging up my ALL feed with things I dont care about (for example, sports ball or foreign language comms).
I just donate them when I'm done. Often you can buy the physical CD cheaper from places like discogs than you can a digital version. So I don't feel bad giving them away afterwards. Someone might even discover the bands I love.
Did you get a knockoff? www.baofengradio.com is the legit url that I've bought baofeng radios from, and I just checked the boxes; no flags or bible verses.
As long as it's fairly priced with proper privacy, definitely.
kagi.com is a paid search engine like you describe.