If you ban online advertising, every publisher you know and like will either exit the market or need to use a paywall (which are famously… popular and successful for niche publishers? No.)

You can call online advertising loathsome if you want (indeed a lot of it sucks - no argument!) but it pays for content that everyone consumes. (Unless you only use HN, which is 99% of the time a collection of links to other sites with ads or paywalls or both.)

Regulate online advertising - fine. But “banning” it (what would that even involve?) is not a serious suggestion.

And the only 'users' of these websites will be rich people? Because the moment a paywall goes up on a website it becomes unusable for a large portion of the planet.