i actually had this conversation with a friend last night, and we figured the effort put in to serve ads to an audience so vehemently blocking them probably costs way more than the potential revenue, considering if a user is blocking ads they are probably hostile to any messaging anyways. But that's before getting into the rabbit hole of saturation strategy and any press is good press type of theories
This was probably correct until a couple of years ago. Ad-blocking has now become much more commonplace, hence the advertisers innovating so hard to get around it.
'normal' people are starting to run ad-blockers now, not just tech-savvy users.