I have recently had similar ads sliding in from the left side of the ETO screen, on Win 10 & Chrome.
Chrome has both Adblock & Adblock Plus installed, but the problem persists....
I just realized that when I upgraded my browser, Adblock was re-enabled on this site. That may have been hiding them. I will disable Adblock on ETO once again and see if I start seeing the popups here.
Just for the record, I find those popups to be on the same level of irritation as someone getting in my face and shouting at me. I make a note of whose advertisement it is, and make a point of never giving them any future business. So, the owners of this site and their advertisers may want to take that into account. I've got nothing against ads. Just put them down one side of the page where we can look at them or not. That's what sensible sites do.