That is most certainly not from me. And we just got done doing a full network sweep. It looks as though it's coming from a Google Ad. They have been notified and I am hoping they fix it today. For now, BLOCK.
I got that as well about a week ago or so. . . (Too much overtime in the past two weeks, days are a blur) I had it pop up, blocked it and I can't remember where I opened GJ from but I also had to sign in again, not sure what booted me out.