Devs claim it isn’t a bug. It isn’t consistent with the other exclamation mark notifications so, in my opinion, it is a bug.
But, they probably intended it to be in your face annoying, just like the ads. They promised before the ads were released that they would be easy to ignore. Except… The permanent exclamation mark even after you click on it…
There is a reason why some people on the forums have the exclamation mark as their profile picture. Yeah it is a small thing, but still annoying.
Jeah if it was me I totally wouldn’t fix it. You just know there’s people out there that just can’t help themselves when they see that stuff and the people that get annoyed by it aren’t going to quit the game just because of seeing an exclamation mark.