Why is this happening again??!
I'm seeing about 1 to 2 a week now. Always from new accounts with 0AP. New accounts should be restricted from comm (especially through the intel map) until they reach a certain level or perform some specific in-game actions (such as capture a portal).
There are earlier discussions about this.
It seems that Niantic managed to break their spam filter. I've gotten a couple as well, but it's not nearly as bad as a few years ago when I got a few per day. I have faith that Niantic will sort it out eventually.