Can you source your claim? Because it seems like it would create a competitive advantage for a non-hostile advertising company. Websites aren’t any happier about cookie banners than users are. If it’s just an emotional, spiteful reaction, the grownups should be able to make a fortune.

You'd think there'd be some "competitive advantage" to be had, but when their entire industry is built upon tracking and profiling everyone they possibly can, they'll do anything they can, fighting tooth-and-nail to the very end against any legislation that somehow interferes with their tracking, even if it means resorting to childish and petty temper tantrums that further enshittify the web. What little "competition" exists in that industry all fully believe that building massive profiles on everyone is the only way to make any money at advertising. They've been allowed to get away with it for so long that they can't even remember there was a time when tracking everyone all the time everywhere wasn't even a thing (and yet advertisers still managed to advertise back then, somehow)...