The only other one I know is from Warframe, which is free but still pretty bad for a number of reasons. I think throwing the rewards into the regular reward pool sounds good, but I'm not familiar with the game so I can't really judge how this actually plays out. In WF they throw the old rewards into a special store that uses currency earned through the battlepass, so you still have to play it and let it dictate your game if you want to buy them. In the case of WF though this whole system came on top of already existing tactics to keep you in the game & playing certain content, like the relic rotations for example. It was like the last drop that eventually made me quit. So it's hard to judge from the outside when I don't know the game, but in general I find such mechanisms terrible. It's sort of like dark patterns but adapted for video games and inherently predatory.