Friendly reminder that he could not have stolen the deposits in the manner he did if this was on-chain and the users self-custodied. Yes, DEXs exist. Yes, you can self-custody on DEXs.
Nobody can steal your FTT tokens either.
It's also correct that FTT tokens are worthless.
An argument against the worth of an arbitrary token created on a permissionless blockchain is not an argument against the good, useful, valuable properties of blockchains, such as the fact that you mathematically cannot be stolen from without physical coercion or profound negligence.