Update EIP-3074: Update eip-3074.md (#8412)

Update eip-3074.md

EIPS/eip-3074.md

@@ -337,6 +337,10 @@ Allowing `authorized` to equal `tx.origin` has the possibility to:
 
 The authors of this EIP believe the risks of allowing `authorized` to equal `tx.origin` are acceptable for the reasons outlined in the Rationale section.
 
+### Sponsored Transaction Relayers
+
+It is possible for the `authorized` account to cause sponsored transaction relayers to spend gas without being reimbursed by either invalidating the authorization (i.e. increasing the account's nonce) or by sweeping the relevant assets out of the account. Relayers should be designed with these cases in mind, possibly by requiring a bond be deposited or by implementing a reputation system.
+
 ## Copyright
 
 Copyright and related rights waived via [CC0](../LICENSE.md).