sandbaggers of chess.com -why?
Sandbagging is perplexing. I once played a 1500 blitz player in an under 1200 rapid tournament for 1st prize and we chatted or he trashed talked. I called him on it and his reasoning was he hardly plays rapid. I rebuttal that this is your third tournament attempt; he just wanted a tournament win.
Fortunately I played the spoiler and check mated him.
Unrated games are full of people like this. Ratings basically mean nothing half the time. Easy to create an account, say you're an expert even if you know nothing about chess, start at 2000 or whatever, then just play unrated. Equally, there are players at 200 that play more like 2000. I personally don't care but basically you have to assume everyone is good.