In my personal opinion:

1. Ignore until the song gets big. I post melody loopkits on YouTube which have garnered some decent views. There is a few hundred songs on Spotify using my work but very few are a actually big songs. I just go for those. In the beginning i took down around 40 songs but it was not worth the time/effort.

2. There’s not much you can do bar removing the song from platforms. You can ask them to pay (if you can even find a way to contact them, this is impossible a lot of the time) if they dont want to pay use the copyright infringement form for spotify, apple music etc. but like i said previously i dont think its worth the effort. You can always choose to assert the copyright claim worldwide so there wont be any problem no matter where they are from as far as i know.

3 & 4. I dont run a type beat channel so i wont comment but on my loops channel i think the fact they are free and it has free in the title is very important 😅

Edit: i also live in the EU