It's just speculating, but
Could be a blacklisted vendor who sold the customers addresses or gave it to someone to get 'revenge' by scamming users.
That would also explain from where they got our email addresses.
We've already had vendors/scammers ddos'ing the board and blackmailing users and admin. So it isn't that absurd.
Given the name, it could also be a crazy user or competitor who doesn't like dr. Faustus and somehow got customers emails. But I've never had a convo with him, so I dont know from where they got my email.
And ofc it could also be people from a 'competing' forum hating on DBG and making drama. When dbg is down, many of us went to that certain forum and registered with email addresses. One of their mods even admitted that she hates us and everything here is fake and scam.
Then in the header they put the name of that steroid site to cover thats it's coming from them.
Now if everyone would list any vendor they had contact with recently (stupid idea though), you could see if there's always one vendor who got used by everyone who also got those messages.
Then you maybe know from whom it's coming. What people would do with that information, I don't know.
And again: it's all speculations and it could have 1000 other reasons.
That's why I just ignored and moved on