I've certainly ran into cheating on both Xbox Live and PSN. My friends who play Mario Kart and Splatoon online on the Nintendo side tell me it's quite bad there too.
The switch got hacked pretty badly so their platform is no longer secure. After doing some searching the xbox series and PS5 still look to be secure. While the PS5 has a jailbreak for early version I doubt it can play online games with such an old firmware.
I'm surprised ran into cheating. Perhaps the game supported cross play with insecure platforms?