I remember a bunch of TLAs approached most of my friends in college, but never took an interest in me.
At the time I thought, "That's stupid. I'm the best phreaker in this NPA!" Later I realized this might be a liability, not an asset.
but they generally are not the type to be filtered by an email domain requirement.
They are exactly the type to filter by something as "trivial" - 99% of their target audience is Math nerds with .edu emails.The other 1% will go the other 99% of the way to acquire the needed materials to satisfy the target condition. Which in this case, is a room-temperature check compared to the challenges.