Its really hard to tell if someones cheating based on the things you can check because it can look like low ping or just a slightly better than average player. In those cases, our genuine best players might accidentally trigger. (which has happened)

There are egregious examples of cheating, sure, but those people are always banned within the hour.

The real killer was the free weekends, it makes it so that there is no “cost” to cheating for a while since being banned on a fresh account has no meaning.