I’m okay with unobtrusive ads as long as the place serving them up has a modicum of common sense sensibilities about their impact and has a rigorous enough vetting process that they’ll never be used as payloads for malicious software. Ads can be a way to find out about products I might otherwise never know about. I’m not outright against all ads as a concept. Hell, sometimes it’s an actual art form in rare cases.
I’m just against them taking up more space than the content itself, impeding my access to the content in any way, hijacking my property, or getting hijacked by malware which then hijacks my property.