There has been some match fixing in Germany in the past, the last publicly covered one was this: https://en.wikipedia.org/wiki/Bundesliga_scandal_(2005)
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.
This is another point I have always talked about in different threads here in the forum.The referee has a big impact on the game outcome if he decides to do so.I have only rarely seen real punishments to referees which clearly have acted in favor of one team.