For me it was Warframe. I adore the style of the game and it’s lore. The gameplay and variety of the different weapons and characters gave me a lot of fun playtime. But the way RNG is used and how timed special missions are abusing dark patterns became more and more clear, the longer I played.

And at a certain point I realized the addiction it nurtured in me and I had to stop cold turkey and never touched it again afterwards.