Maybe i'm old fashioned, but personally I think the onus should be on the person sending out unauthorized malicious requests to figure out how to not do that.
Any responsible bug bounty researcher reviewing the DNS zone by hand would spot the CNAME and remove it from the target list. You don't get to wash your hands of that because your chatbot did it.
Any responsible bug bounty researcher reviewing the DNS zone by hand would spot the CNAME and remove it from the target list. You don't get to wash your hands of that because your chatbot did it.