Actually they have several different products based on IP type and quality. The credit-card only access you're talking about is for shared and flagged residential proxies. ISPs legally sell them to businesses and they can work for some use cases, but you need a video call and KYC to get access to a high quality IP pool, such as real mobile IPs they source from p2p services like VPNs.
There is nothing in that explanation that makes it sound anything like an above board trustworthy business that doesn't make one feel dirty for interacting with.
> you need a video call and KYC to get access to a high quality IP pool
They need to know who to blame (cough come after cough) if their top-shelf stock gets tainted by some script kiddie.