Profit share is in the introductory paragraph, and the key, but is not present on any of the email providers. This makes the guide feel unreliable/poorly made. If it's present to be used in a future version, or referential to other guides, that should be noted to avoid confusion. The purpose of including "Profit share" is unclear.

Andy Yen can get stuffed

I was using Spark mail (https://sparkmailapp.com/) client for Outlook and iCloud before I switched my current provider, can recommend but don't know which of the mentioned providers it works with.

I disagree GMX is not in the eco-system tier; they have a calendar, drive app and online office suite. It's not as extensive as some others but their service includes more than just email.