They say they have the right to close any account without any reason and confiscate its funds.
Online casinos have their terms in ToS that allow them to terminate user accounts if they found something broke their ToS. They never close user accounts without any reason, because it damages their business reputation.
Roobet is a big casino with very good reputation, and many years of operation, they won't terminate your account without reason.
https://roobet.com/terms-and-conditions6. ACCOUNT SUSPENSION AND CLOSURE
6.1. We reserve the right to close or suspend your account if:
a) We understand that You are using or have used the Website in a fraudulent or collusive manner or for illegal and/or unlawful or improper purposes;
b) We understand that You are using or have used the Website in an unfair manner, have deliberately cheated or taken unfair advantage of the Website or any of its User or if your Account is being used for the benefit of a third party;
c) You are in breach of these Terms, the applicable regulations or the fair use of our services, or we have reasonable concerns to believe that You are a compulsive problem gambler;
d) We suspect that your Account has been compromised or is being used in breach of our Terms.
6.2. If We close or suspend your account on the Terms set in the paragraph 6.1., You shall, to the extent permitted by applicable laws, be liable for any and all claims, direct losses, liabilities, damages, costs and expenses incurred or suffered by us (together, the “Claims”).
6.3. If We close or suspend your account on the Terms set in the paragraph 6.1., we are entitled to void any bets placed by You following such actions.
6.4. We reserve the right to close Your Account at any time at our own sole discretion and freeze all remaining funds on the Account
I have over 1,500 invitees and over $10,000 in my affiliate account.