Or Posteo, Mailbox.org, Tutanota, Riseup.net, etc.
Or self-hosted.
A lot of people are listing plenty of alternatives for email, but the majority of people aren't going to be this broad in email usage.
Let's be real here, the vast majority of people use Gmail or Outlook. And importantly, businesses. iCloud breaks into the consumer market though, but these are by far the leaders.