As far as I've heard (no numbers) the games platform is still fairly popular - which was a surprise to me because I've not seen any games in my feed for years.

As far as I've heard (no numbers) the games platform is still fairly popular - which was a surprise to me because I've not seen any games in my feed for years. Apparently this is because facebook realised how annoying it was for non-gamers to get game spam, so they automatically hide the gaming widgets from people who avoid using them. (It is possible that your view of "gradual but consistent desertion" is accurate, just pointing out that it seemed like that to me too, but things are not always as they seem)