HBD bond is entirely possible and in the near future we will support holding staked hbd directly within a smart contract. The problem is the L1 would offer the same return and only a 3.5 day lock period. The contract could theoretically set a very long lockup period, but it would make more sense for a user to still go to the L1 instead. As for ETH staking, that's not possible as Eth staking is heavily tied with running a validator and thus an inherent risk that the network cannot take on or maintain.