The self governing APY is the biggest sustainability method. The problem with auto rebasing protocols is that APY is fixed meaning it can’t be adjusted or Dynamic which means it can be adjusted but only for everyone at the same time.
Self-governing APY punishes those who sell and rewards those who do not. The inflation of the token by design is going to long term holders who do not sell and the sellers lose APY every time they sell. This leads to the sustainability being regulated by player’s behaviors.