I signed up there with crypterium.io@mydomain. Some time after, I start getting blockchain-related spam to that address. I wonder how that happened!
When I pointed out on their Telegram channel that one of two things had happened, a) they sold me, b) they got hacked, I was threatened with a ban. Their fans thought I was a raving lunatic.
I now have a support ticket open. Surprisingly it isn't really going anywhere.
I no longer accept email at crypterium.io@mydomain...