why some sportsbooks have different limits for different sports?

So I noticed some sportsbooks let you drop way more cash on NFL or soccer but barely anything on stuff like darts or table tennis. I was trying to run a system I call The Margin Squeeze across a few different sports, but the betting caps are all over the place and it’s kind of messing with the whole plan. I get maybe they trust the odds more on big sports where there’s lots of action, but it feels like there’s more to it.

I get why blackjack has table limits and all, but for sports I’m not sure if it’s just about popularity or if there’s something else. Maybe certain sports are easier to rig, or they just don’t want to get crushed by people who know these smaller leagues better than them. Anybody here actually know how these limits get decided, or got burned trying to put down a big bet on something random?