Fantasy sports is when you pick a fake roster of players, subject to certain rules. You get points based on how well your chosen players do. Carlsen is the best in the world at this. And at chess.
It's a very luck based game, or so it seems. With 7 million players. But last year the world chess champion was top-100 and now he's (at this particular moment) first.
Being good at managing uncertain outcomes is not luck though, although the difference between that and luck is nuanced and this often gets lost in discussion.
This is very true, which is (for example) where the skill in high level poker comes from.
There is indeed skill in managing uncertain outcomes and being rank 100k or rank 100 is a clear indicator of a skill difference. But there is indeed luck also, and you can't really tell the skill difference between the world first player and probably the first hundred, because the luck factor weight more than the skill difference at this point.