Yeah, what Kim and fboab said. Zwift doesn't actually give a monkey's about cheats as really it doesn't mean anything. The vast majority of users don't race, so it's totally irrelevant what other people do, and most of the people who do race do it for fun, not in the belief that it's serious, valid competition. For the tiny, tiny minority who race the curated competitions, the efforts they go to to ensure people race fairly are quite significant, and they are quick to disqualify suspected cheats (don't play with the data, children!), but even then there are a few obvious loopholes.
I rarely race, and when I do I don't expect to win anything so I don't really care what anyone else does, but I do belong to ZwiftPower so the results posted there at least exclude those who race out of category.