Bots and Cheating
The site does not use bots in the player pools.
As to the rating increase of your opponent, the site uses the Glicko rating system that includes a measure of rating uncertainty called the rating deviation (RD) value. Large gaps in play or few games cause an increase in that RD value which causes larger rating changes after games and as more games are played that decrease, as will the magnitude of rating changes.
As to your other point, the vast majority of players are playing fairly.
https://www.chess.com/article/view/online-chess-cheating
Oddly enough, the 2 who replied have pretty suspicious accounts and stats...
bruh there is no way martainstahl is a bot. you obviously don't know much about Chess.com. Martinstahl is a Chess.com moderator, and he has a real life job, so he can't be fake
the dude probably rarely plays on Chess.com, and only plays on lichess, and now he's back on cc
I am baffled by amount of people who can't accept that they lost and cling to whatever evidence they have that their game was rigged by an outside source.
also, an offbeat opening and strong attack is barely evidence. I'll try to find the game so I can see this for myself but maybe they just suck at openings?
https://www.chess.com/live/game/125279317627
There you go. 1400 vs 1500. My rating was 1700 3 weeks ago. I really don't understand what's going on with this website, as the previous user said, there's something odd going on. All these players, I've also noticed alot of players play horribly at the beginning then they take a long pause before playing best moves. I think it's unfair the way people dismiss people when they talk about fairplay