actual relayer (msg.sender) not asserted, behaving currently as a fee_recipient

[datgrog]

Right now Dach's Dai or Chai actions does not

require(relayer == msg.sender, "invalid relayer");

I could understand useful scenario such as a backend relaying meta-tx concurrently from differents EOAs while collecting fee on a specific address. However such implicit behaviour looks kind of "dangerous", given that its implicit. So right now, relayer parameter behave as a fee_recipient and if not asserted then a backend's relayer's EOA could be potentially emptied.

[yashnaman]

I do not understand how a backend's relayer's EOA could be potentially emptied ??