So... isn't there something in user agreements that avoids this sort of thing? Maybe I should read it closer, but I would expect "will not sell my email address

So... isn't there something in user agreements that avoids this sort of thing? Maybe I should read it closer, but I would expect "will not sell my email address to third parties" would be a common clause. And if it wasn't, I'd expect some sort of consumer backlash. Sorry for the line of questions, this is sortof a jolt to my view of reality.