Hi,

This is a bit similar to the situation with games that only track playtime and don't include achievements, except that here the winner may already have some time logged for the base game. What I would suggest to do is record their playtime before receiving the gift, and then see that it increased a month later. If not, then they obviously didn't touch it and will be kicked. I also added this as a note to the GA (in the group-tool), but it would be best that you remind us when it ends.

Alternatively you can delete the GA and re-create it without Playing Appreciated.