Small print, excessive legalese and outright deceptive language in ads, agreements and such. All the “free” (not really free) trials, “unlimited” (not really unlimited) plans, “best value” (according to the producer and their mum) deals and shit like that.
There really should be a law prohibiting that - if reading through terms and conditions for using a damn website or a toothbrush or whatever requires 4 hours of free time, a magnifyibg glass and degree in law, such t&cs should be illegal. Same for disclaimers and such in ads - any 4pt text displayed for 2 seconds on screen should automatically result in a massive fine.