[grawprog]

But, for 90% of websites that force me to use an email, unless it's for something i'm paying for or care a lot about, I use one of several email addresses I set up specifically to sign up for websites and never look at them again.

If I didn't have to give an email, I'd probably still use those services, reddit comes to mind, i'm only signing up because i'm interested in the first place.

Having my email and spamming me...sorry, remarketing to me, makes no difference to my retention because I never see it. Providing a quality service I care to use is why I stay with things.