I don't know whether fix matches occur in the leagues where I usually bet, because these leagues are big leagues and if there is a practice of fix matches, of course we will know about it when it appears in the media, but so far there hasn't been, and I guess that there will be more fix matches. happens in small leagues because maybe leagues like this don't get the spotlight from officials who will of course give punishment to the club that does it if it's proven to have happened.
Bettors will not be able to know that there will be a fix match unless they get information from insiders