>we should go to every e-commerce site that employs them, with full crap-blocking privacy mode on, load up on products/services, and then abandon our carts at the captcha.

I've been doing that for years [well, not the shopping trolley bit] on websites which throw fullscreen modal announcements in my face. The second it happens, I click off that website. I dream that the webmasters in question will have some advanced stats setup that tells them that, as soon as they digitally shat in my face I abandoned their sites. But, unfortunately I know it's an empty gesture.

https://stiobhart.net/2015-05-04-overlays-new-popups/