I was looking through the keys in one of my key groups and noticed a key with a disproportionate amount of downloads, which probably meant it was shared with other people.

Suggestion:

It would be nice if the Download keys and Key group pages had a sorting option so you could choose to sort the keys by date or downloads (preferably being able to toggle between ascending/descending as well). This would make spotting keys with a weird high amount of downloads a lot easier, as opposed to having to manually scan every page of the group.

If you search you might find some of the threads that will tell you this: the counter for downloads is not reliable. It does not count complete downloads. Someone with a faulty connection can be counted lots and lots of times while trying to download.

Also, if someone wanted to share your game, they could share the game itself. Why bother with the key.