I didn’t see anything, I needed to turn off the uBlock Origin add-on to see what was that about. I even give them a random email generated to see what they do, and I didn’t receive any email, neither.

For me, it’s a nice experience if I didn’t try to figure out what was happening and disabled the add-on.

EDIT: Didn’t work for me because I have the add-on “I don’t care about cookies” and seems it starts to show all those ads when you click to the cookie pop-up.