OK, let's take that a bit further. Why even have it look like it came from someone else? Why not paid fraud (impersonation) using cold hard sats? We are talking about sending a message right? Fuck it. Go all the way with it.

It does not cause impersonated accounts, that is a separate issue. Also, spending a bunch of sats to fake a user is probably a poor investment since the fake user is going to get muted out of peoples' web of trusts.