In Estonian they're "nahkhiir", which means skin + rat.

It's the lyrics of the song

Vaxxmaxxing

payed

paid

Commands are usually just easier ways of doing the thing, so that is usually what is told to people with problems.

Like you can browse through 5 menus and find the thing or paste the command and be done. If you don't want to paste the command, then just look through settings/menus.

Definitely is a thing in Estonia.

Seems a bit like engagement farming. If you use some word/phrase incorrectly, there are going to be people that are going to be commenting on it. So on algorithm-driven platforms, the post would be ranked higher.

Just use NewPipe / Tubular and only watch people you're subscribed to.

I use Steam by adding apps as non-steam games and forcing it to use Proton.

Solution:

Maybe the "B" was rusted and done over with a marker?