When you're the GM of a game and someone posts in the LFG forum to apply to your game, you should be able to temporarily access or view a summary of their interactions with other GMs. When someone has been a player in your game, you should be able to make a mark on their profile (viewable only to you) with multiple choice options for things like, dropped out of the game without notice, stopped showing up (or never did in the first place) but didn't actually drop out, kicked from the group for good cause, etc. Of course there should be good variations of every item too. It's sort a sort of rating system, but not as abstract or subjective as a 5 star system, it's specific; X many GMs have said this player just ghosted on their game and only Y GMs said they enjoyed playing with them; or X GMs say this player dropped out of their game but sent them a courteous message explaining their reasons or even gave the GM some notes and an opportunity to improve their game. To be fair, players should probably have this too. But I think it needs to be a list of multiple choice options, if there is an "other" box where they can write something in, that has the potential to go bad because people will write comments in an emotionally heightened state and this will lead to drama. I think a long list of specific (but all too common) reasons for leaving the game or enjoying the game would be better than a blank text box.