But it would be interesting to know, perhaps in percentage terms, what is the percentage of fixed matches in different competitions. After all, fixed matches basically just redistribute winnings for both players and those who place bets, and for bookmakers too, of course. And it may well be that fixed matches are staged and the result is the opposite.
If such data is available I think it won't take long before the government or someone else takes them down for obvious reasons. Assuming someone researched this and managed to get insider information from various sources, there's no guarantee someone from the government won't stop at his door tomorrow. That being said, I don't think these cheaters are that stupid. Maybe we can see their mistakes in a lower-level competition where there aren't that many eyes watching, but I doubt we'll see a highly organized fixing ring in a huge competition like the World Cup or something similar. Maybe that's why OP is looking at second-tier divisions to get more credibility, although it doesn't seem to work.