Someone did just this (folded when he/she could have checked) and I was holding a Royal Flush.
I'm either blind or confused, if this statement is based on the screenshot shown.
1. I see where nobody folded when they could have checked. You and sandyhook limped (?) and BB called. BB checks flop, you minbet (??), sandy calls, BB folds. While a minbet is often referred to as a check, you can't really say BB folded when he could have checked here. Unless I'm missing something?
2. Minor technicality, but you didn't actually hold a royal.
The hand ended on the turn and you rabbitted the river As, but rabbitting is actually a useless gimmick since Merge has a continuous shuffle. A millisecond sooner or later for any of the previous action (or if sandy called the turn bet) and that would have been a different river card. The only site where rabbitting would accurately indicate the cards to come is
pokerstars, where they have a static shuffle just like a live dealer. It's really a useless feature designed to appease the fish who like to rabbit. Of course the point could be made that it's not a useless feature if it encourages fish to keep chasing with crap hands, LOL.