That is way too hostile for a first contact. It would be much better, at first, to politely ask them to comply with the license. If they ignore you, or refuse, then think about escalating.
For example, this is the PR in OasysDB by one of our contributors compared to theirs: https://github.com/oasysai/oasysdb/pull/43 https://github.com/Sahomey-Technologies/sahomedb/pull/9