Hey,
the antifraud team decided that you had used several accounts on similar ips which is clear evidence of cheating. We have it in our T&C that players can't use multiple accounts. You are welcome to withdraw your initial deposit. We are more than happy to clarify anything else.
Similiar ip addresses is far from clear evidence of cheating. Just KYC him like you would with a player trying to cash out $200.
By the way, the only mention of ip address in your T&C is this:
When you visit the Website, our system automatically collects information about your visit, such as your browser, IP address, and the referring website. This collection may be done in conjunction with our platform providers and partners. We may receive from them general demographic or usage data of our Website visitors. We do not use automatically collected information to identify you personally without receiving additional consent.