The quality of full screen takeover pages seems to have dramatically risen recently. My family members, who don’t know the Escape key exists, accidentally click one from a banner ad every week now taking them to a page like examplefoobar38561.cloudfront.net and the use of elements that imitate browser or OS chrome (generally imitating Windows Defender or similar) has reached near perfection. All browsers should have a setting to permanently block full screen mode for all sites (not “ask”).