Thought as much, I don't believe there's any league where such activity doesn't occur. Some might be obvious than the others but if you play close attention, you'll observe some irregularities in all the league. The VAR is one of those feature that make decisions to favor some clubs over the others and this can be used to manipulate matches. The referee too are also guilty as they tend to be soft on some clubs (players) while been hard on the others.
Concerning the topic title, I won't mind placing a bet in a league with serious allegations of collision not minding the risk involved as far it could still be profitable putting into consideration they are opportunities everywhere.
I think swogerino and Ty are right, and we all remember Italy from 10 years ago also had bad matchfixing scandals that even caused Juventus to be stripped off their titles (such bad luck for those not involved). But I think OP also has a point in that like some leagues even where I come from, there is no way to monitor the smaller teams and amateur leagues. I would never bet on them.