why is Sicilian often ignored by low ranking players?


As white,I play 1.e4. The most common response, in order of frequency, is 1. e5, the Sissy, and the Scandanavian. So I'd say 1,e4 c5 gets played a lot by players in the 1200-1400 ELO range.

Beginners and intermediate players don't (and shouldn't) play Sicilian cause it isn't (to them) a reasonable way to play the opening. Of course, there are always some that will listen to those wise Youtubers and waste time on studying opening lines before learning how to capture pieces and checkmate the enemy king. I've heard some of those 1000-rated players spening money on chessable courses openings-related.