The people that do spend the time trying to find out what it is for will remember the eNgAgEmEnT from needing to find out what it is and that correlates with future sales. Just like "rewards" programs that are designed to mentally lock someone into the store/product while harvesting their data.

I use adblockers but my parents don't. Visiting my folks and seeing the ads they get served is just bizarre. They get served ads in Spanish even though there's nothing about the account, device or geolocation that would indicate the audience is Spanish speaking, they get very long ads for medicines, which...you know how they always list an increasingly long and concerning bunch of side effects? Well the last one I saw ended with a full reading of the drug's MSDS. They get ads from car dealers half a continent away, campaign ads for a different state's legislature...Why was there ever a television advertisement even made for General Electric power plant turbines? Who's watching Zeltik, gets a mid-roll ad for gigawatt generator components and makes any kind of decision based on what they saw?