Legitimate question: are you ever going to watch those videos again, ever?
I don't go to concerts as often as I'd like, but when I do I'd far prefer to take in the moment myself vs. trying to capture it on my phone. I'm there for an experience; not a recording.
If that action makes your night better, so be it. I won't get in your way. I do, however, get annoyed when I'm trying to watch an act and some idiot's phone is held above their head, blocking my view.
Each to their own, but personally I don't "get" it.
If you're (sensibly) encrypting your data before sending it off site, then yes it likely makes little difference where you send it. The parent comment didn't mention adding your own crypto however.
Further, I just personally wouldn't trust my data to a personality like "Kim dot com".
I strongly recommend Mullvad. Exceptional performance, wireguard support and if you're really paranoid about anonymity you can literally send them money via post.
Sure. Open the app drawer, long press an app and there's a weird icon towards the bottom of the list with a plus symbol that'll let you add a new tag.
After you've done that you can long press on the tags at the top to add/remove apps in bulk.