What's happening to #Tutanota could eventually happen to your email provider as well. Users of the #email provider were banned from signing up for #Microsoft Teams and #Crunchyroll. This is how they lock us into #Gmail.
Eventually, in the name of "fighting spam" they will block all email providers, especially those on custom domains, unless the domain just happens to be associated with one of the big companies, such as Gmail, Outlook, iCloud, Amazon, Comcast and Zoho.
P.S. Since #DuckDuckGo launched their email service today, who knows if they'll be able to get away for it for much longer.
https://yewtu.be/watch?v=JimR-esQYt4
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Video by @BrodieOnLinux