This is a really good argument not to "allow unobtrusive ads" in your adblocker. This is an example of an ad that would be allowed. Just FYI this is the default behavior of some adblockers, notably Adblock Plus.
The best part was that some websites had two versions, one more aggressive one, and a slightly toned down one. If you didn't have an adblocker, you got the first one. If you did, you got the second one, because apparently the ABP people did draw the line somewhere.
https://i.imgur.com/1OGHbAW.png https://i.imgur.com/4r7PAl7.png
(some slightly NSFW content in these example images:)
https://i.imgur.com/ZF9G7fZ.png https://i.imgur.com/hkkvuXd.png https://i.imgur.com/1N2o3QT.png
uBlock Origin with Firefox is definitely the way to go now: https://github.com/gorhill/uBlock/wiki/uBlock-Origin-works-b...