Thanks to Molly for this bit of info:
I emailed the different email addresses shown in Sam’s inbox during one of the videos, and one of them (firstname.lastname@example.org) replied to me a few hours ago. I originally asked him how he knows Sam and why he is in contact with him, and got this reply:
Since the dawn of our species, man’s been blessed with curiosity.
Your curiosity will be rewarded.
Zeke Klotho Freundlich
Interestingly, though it is signed Zeke Klotho Freundlich in the actual email, in my inbox it says it’s from Tom Friendly!
Hope you find this intesting, even though it doesn’t seem to have any exciting info (unless that Zeke name is an anagram or something, I haven’t really looked into it very far).