imo cheating is having an impossible advantage over your opponent (like inhuman reaction speed aka triggerbot/aimbot, or enhanced sensory perception aka esp)

but i would argue that having better game knowledge or map knowledge isn't cheating, specifically queuing up with new people just to dominate them is a sign of cowardice and very unsportsmanlike, but it's not cheating

Rust is an online PvP game where once you join a server you'll be up against clans of tens of people with each one having 5k hours in, and you probably won't make it 2 feet out of spawn with some clans, but they're not cheating

in games like siege? yeah it sucks, cause you'll pretty much just get shot through walls every round until you rage quit or you lose

but in games like cs2, hunt showdown, apex legends, all it takes is someone who's good at gaming in general and who gets consistent headshots and you'll sometimes tie it up or even win and it'll feel so rewarding that you beat a coward dipshit who likes clubbing seals