Calyx uses the wireless data service as a membership premium to help pay for their crypto and privacy supporting activities: to pay for multiple gigabit connections, data center space, etc.. to offer a whole array of free security and privacy services to the public including our LEAP based VPN, their encrypted instant messaging service, and their many Tor exit nodes.
The upshot? For $500, Calyx will send you a little wifi hotspot with a Sprint SIM in it that comes with a year's worth unlimited, anonymous, unshaped, unfiltered 4G/LTE bandwidth on Sprint's network. Unlimited as in, I downloaded 60GB with mine and it didn't break a sweat.
And it's a tax-deductible charitable donation.
Subsequent years are $400 (because you don't get another wifi gadget, just the service).
I've used mine in New York, Washington DC, New Orleans, Reno, Los Angeles, San Francisco, Kansas City, Boston, and Woods Hole, MA. I've had it for a couple months, and I find it lasts for 2-3 days on a single charge. I love being able to just open my laptop and go, without having to login to a hotel or airport wifi's bullshit authentication screen, and I've saved a ton on my phone's bandwidth charges by using the hotspot for network access on it.