AFAIK no players are actively cheating in that community, although some prefer to play using timenudge, which could be considered an "allowed cheat". Fortunately it's quite easy to spot those laggards, and it's up to yourself to decide whether you want to opt for fair play or not... (Also, it feels quote good to beat them even though they have an advantage over you.)
Also, it's rare to have skilled players that cheat, so most cheaters are easily detected.
And to add to unfair advantages: I have very good ping, and also noticed I moved up on ranking after switching from a slow monitor and Bluetooth mouse to a gaming monitor and - mouse. While this is not considered a cheat, it might give you an unfair advantage over the players who use less then average hardware.
I assume it's part of human nature to figure out ways to get an edge over others, and the difference between legal and illegal is mostly about subjective standards. A good example would be doping: as long as it's not on the doping list, it's considered fair play; I recall a trend of asthma along professional road cyclists a couple of years ago. Once the needed medication was on the doping list, the trend reversed immediately.
In my experience these additional "optimizations" are unavoidable.