Hang on, though: doesn't this essentially hand Apple a big list of which domains you communicate with and how frequently? There's also nothing stopping them reading the emails on the way through. I know a lot of people trust Apple more than Google, but you're essentially signing up for a vendor-locked product that you're hoping Apple will continue to support, with no guarantee they won't collect - even at an aggregate level - your communication preferences.
They're even slightly pre-filtered for Apple's convenience, as the times you're likely to use Hide My Email are for shopping and social media - nice, ripe marketing targets.
If you use Gmail, there's also nothing stopping them reading the emails on the way through.
If you use Outlook, there's also nothing stopping them reading the emails on the way through.
If you use Yahoo, there's also nothing stopping them reading the emails on the way through.
If you use virtually any email provider this is true.
Why can't we just be who we are and people learn to be more accepting of how others are?
This sounds immensely boring, shifting everyone to use the same/similar body language, tonality, word choice, etc.
Maybe I'm strange, but I must prefer the diversity of people as they are.