I've been wondering how long it would be before something like this happened ever since e-sports cycling started. Longer than I thought it would is the answer!

I'm sure there's simpler ways as well: you could manipulate the spindown test that the turbotrainer does for calibration to make it think the flywheel is heavier than it really is, for example.

At the non-pro level cheating is absolutely rife. Mostly through people lying about their weight. In every open zwift race there are performances that would put a person in the top 0.1% of riders globally being put down by half the field!