Suggestion: Keep a record of past games for GMs
Long-running games don't get purged for a long time. If they had a long-running game, say, two years ago, that will still be in the Deleted section. Depending on your definition of `long-running', I suppose, but I just had one vanish two days ago that was deleted, I believe, at the start of 2012, so that was almost four years.
If it's the kind of GM who does that, they'll probably have new, more relevant, long-running games by the time you're looking -- and if someone had a long-running game that ended five years ago, hasn't run anything much since, and is just starting up again, I'm not sure that that long-ago game is still very relevant.
Short-run games get purged much faster, but if you have a GM who tosses out six new game ideas a month and then deletes them all two weeks in, and the system keeps track of all of their games from the beginning of -- oh, alright, from December 3rd, 2015, say (because Jase is awesome!) -- then by next April, that's going to be a crazy long list on everything they do. And let's say they stop doing that, take a year off, settle down, and come back with a fresh outlook on GMing... that history would be with them forever.
With the way purging works, I think it's set.. at least near-perfectly, for giving a solid, relevant, history and current-standing for a GM, without trapping them forever with past mistakes.