Just a guess, but this is from the Fair Play Policy and may be what's going on:
Chess.com encourages players to be kind and show good sportsmanship. Our Fair Play policy expects that players will not...
- intentionally disconnect during games
- stall to make opponents wait unnecessarily
- frivolously abort games because they don't want to play black, etc. (Note that we have now implemented a limit on the frequency with which users may abort games; please Abort only when necessary. Also see below.)
When I'm playing blitz, sometimes, I get matched up against a player that is a little out of my league, so I let those games timeout before making a move, that way I'm not adding another loss to a better player.
Recently, I noticed that I am now losing the game using this method. It tells me they won by abandonment. Usually, you have to make a move, and then that rule applies, but now it doesn't seem to matter. Was there an update that changed the way this works?
I'm on iOS , by the way.