No, I did not identify myself as a lawyer. I just wrote the letter as a victim of a scammer using Google services to impersonate me.

But I was careful to use certified mail return receipt as google’s legal office knows that this can be used for documentation and proof if the case ever goes further.

In other words, having a paper trail is more likely to get acted upon.

IMHO its doesn't matter who you are. You don't need to be a layer to protect yourself in the right way. if you send a letter with evidence, certified with return receipt, if as a business, or a person, this is a good chance of liability if you don't respond if it ends up in court. There can be consequences for non-reposes. I have always had good results using this method. But you got to be clear about:

A. What the problem is B. Why you think there should be a response (I.E: What could happen if a response does not get acted on from your perspective, what harm could be continued, ect.) C. Set a requirement for a resonable response time and some kind of fee schedule or possible outcome if there isn't a response in a reasonable amount of time.