Anti-privacy company
It's one of those private data hoarding companies. They ask for more private data to complete a 10$ purchase (*after* my card had been charged, mind you) than I was asked for when I bought a $1500 laptop a few days earlier at another online shop, this is ridiculous.
No I will not send you a bloody selfie, it's outrageous enough that you require a phone number verification. If you are worried about my credit card, just use bloody 3D-secure instead of going full Big Brother on customers.
Reply from Gameflip
Hi dear flipper, ID verification is required to prevent fraud activities, to make account related changes, or to comply with required regulations in the jurisdictions in which we operate. Verification are often triggered when conducting frequent or large transactions or required for selling in certain categories. Check here: https://cutt.ly/cUvkdMA