They successfully charged my card for $1 like a dozen times as I tried and failed to get past their check. At the time I wasn't even interested in the free stuff, I wanted to pay for an ARM VPS, and their verification system just wasn't satisfied with something. After getting frustrated I tried to sign up for Hetzner instead and they allowed me to register and spin up a VPS without even having any payment information on file, they just trusted that I would pay the invoice at the end of the month. Funny how different the two companies treat this stuff.