[seppoastian]

"Middle-earth: Shadow of War" comes to mind. To beat the endgame you either had to grind really hard, or just buy loot boxes (to get best Orcs, Equipment and Buffs). They said that the lootboxes didn't have an influence on the game "difficulty", but after they removed the lootboxes the endgame was also patched to adjust for normal play.

They also had a PvP element where you could attack other peoples strongholds, but with the lootboxes it was also pay to win.