The description of Tutanota as an “online encryption service” is kind of weird, it’s an encrypted email service. I guess that’s splitting hairs though.
I use Tutanota myself but I’m in the process of moving off it, not because of security concerns but because the developers are aggressively full-on about security to the point where certain features (search, & interoperability with other clients primarily) are actually hamstrung. So the claim about them being part of some government intelligence apparatus seems somewhat unbelievable to me. But hey, if it’s true then I’m extra glad I’m moving off it.