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Time to celebrate: Tutanota is now Tuta.
(tuta.com)
This is a most excellent place for technology news and articles.
I wasn't familiar with the headlines you're referring to so took a look, here is one story from the CBC. And here is Tuta's post responding to the allegation.
Besides knowing the name I was not super familiar with Tuta, but it appears their source code is publicly available for review for any backdoor (and that Cameron Ortis doesn't seem trustworthy or even especially knowledgeable).
That's my instinct, but its good free publicity I think. The worst thing is not being talked about, maybe there's some truth to that