Sure, and those old sorts of forums still exist (well, the ones that didn't get eaten by Reddit and Facebook—OK, so I guess they kinda don't) but if you want the Web as it exists for most people to go back to standards and competing paid & free+libre solutions, I'm pretty sure banning spyvertising is gonna be a necessary, since those are the two main "services" most people use online, other than email (the rest is mostly shopping and reading news-type sites, both of which would also be improved by banning spyvertising).