It doesn't sound appealing but some are actually cool ads. I've actually ended up using one of the services advertised, BlockFi that pays interest on crypto and many others I bookmarked in case I was interested later. They pop up, max 5 an hour (you can set how many you want or turn it off). Little black popup boxes and if you click on them, you go to a webpage for the product or service.

I'm on an android phone for all of my browsing. I was using Blockada in pair with Brave since my ad blocking options are limited but Blockada has been slow af lately for some reason so I ditched it.