You probably don’t know about it because it’s extremely hard to chart #1 on it and very few acts can manage it even when they have hits. Lol
In order of difficulty
Real time < daily < weekly < monthly
You have to get the MOST number of ULs for a song in a month and each person will be only counted once. So unless you have a shit tone of casual listeners you can’t make it on this chart.
OP