Two of the games that I’ve purchased became free after some time. The first one is PUBG, it became completely free to download and play. The developers gave a small amount of premium coins to those who had purchased the game prior to that. And the second one is GTA V. It was free for a week, but if you got it during that week, it was yours to keep forever. Both games are old enough, so I guess it’s a fair move.
Are there any games in your library that you have paid for but then became free?