Netflix doesn't have these people's e-mail addresses either. Because this is about increasing the price for new customers, not existing ones. And it has no idea who's going to sign up.
(Also, grocery stores very often do have the e-mail addresses of most of their regular shoppers, if they use a rewards program in order to get sale prices. But they certainly don't use it to daily price hikes.)
(Also, grocery stores very often do have the e-mail addresses of most of their regular shoppers, if they use a rewards program in order to get sale prices. But they certainly don't use it to daily price hikes.)