You do not need to earn interest on your BTC - because BTC is already designed to pump forever, and why get preoccupied with interest when it could end up adding too much third-party risk to your BTC investment approach?

In other words, interest on your BTC seems to be a distraction that will lead too many people to give up custody of their BTC when in fact BTC HODLers are more empowered overall by figuring out ways to hold their own private keys.