I have been getting these on this Mobile Nations site as well. I understand the need for ads to pay the bills, but this pretty much made my Pixel XL unusable. This is coming from browsing these forums. I cleared all my Chrome history on my Pixel XL, including stored passwords...everything. Browsed a lot of sites and was free of this crap saying my phone was 28.1% damaged. I go back to the Mobile Nations forums, log in, and not 30 seconds go by before my phone is completely hijacked again. Had to delete all browser data again, and using this site on my PC to post this. For now, I can't go to your site with my phone. Your own advertisers are pulling this crap on you, driving people away from your site. And yes, these come on the screen with popups blocked. You can't hit the back button either to get rid of it. The only way I found is to add another tab, then close the infected tab. This is only temporary as it will pop up on the new tab within a few seconds.