I also got the pm with following subject
The Qtum Test Network Has Been Released!
Qtum is doing itself harm by sending spam messages
We are not sending the messages, and no one is doing it on our behalf. We don't know why this is happening, it could be an attack on our project, or it could be an individual or a group that is trying to lower the price of our tokens to get more.
It's a bit suspicious that our site was ddos'd the same day these spam messages started, and multiple Slack channels were being spammed by Qtum-Patirck, which was obviously fake.
Back in January/February we had this same type of behavior on our Slack channel from someone spamming almost identical messages about another project.