Like most shitcoins, I don't yet know how the drivechain works. However, here are my basic thoughts on blockchain. I don't think drivechain is trustless trust, because for a blockchain to be trustless trust, it must be cheap enough to run nodes as usage grown up. This is why Bitcoin has a small block size - PoW alone isn't enough. I don't know if this is possible outside of Bitcoin. I don't think another blockchain can be a solution.