Why are so many getting capped?

I just got to level 56 today as a operator no double xp or anything how are so many unable to get that high and get xp banned? I have been enjoying this game since its release at midnight west coast.

I don’t know caps or XP bans but it takes a lot of time to get that high. I play halo like 1 or 2 hours every day and I’m only at 30 something.