Because that's the kind of content that attracts the most viewers. Lots of new players will be looking things up on google or youtube such as "how to do [x] valheim" or "where to find [x] in valheim". Then you get other videos that get recommended off those more informational videos, such as "10 THINGS YOU NEED TO STOP DOING RIGHT NOW IN VALHEIM" with a clickbait thumbnail to really draw people in.