1. Did you use your friend's referral code when signing up?
2. In all of the time you or your friend spend on the platform, have either of you utilize their bonuses or promotion program? Any of it?
1. No
2. only bonus like silver/gold/platinum rewards from betting some pennies.
In regards to point number two, considering a possibility that your friends also utilize their bonus features, sportsbet actually had the right to block your account and freeze your funds, both of you. I think the kind of bonus you or your friend use didn't really matter.
I know, you maybe didn't do it intentionally, but unfortunately, by sharing the same IP and utilizing their bonus or promotional feature, you breached their terms and condition, as stated here:
12.7. You acknowledge and understand that separate terms and conditions exist with respect to promotions, bonuses and special offers, and are in addition to these terms and conditions. These terms and conditions are set forth in the respective content page on this website (www.sportsbet.io), or have been made available to you personally, as the case may be. In the event of a conflict between the provisions of such promotions, bonuses and special offers, and the provisions of these terms and conditions, the provisions of such promotions, bonuses and special offers will prevail.