your room uses Poker Mavens software... are you aware of this? https://pokerfraudalert.com/forum/showthread.php?20023-Poker-Mavens-software-hacked-to-allow-superusing-for-shady-operators

with no KYC, what measure are being taken to prevent multi-accounting and/or collusion?

This bug was in old versions and it's fixed after a few days. You can check the Briggsoft statement here https://pokerfraudalert.com/forum/showthread.php?20023-Poker-Mavens-software-hacked-to-allow-superusing-for-shady-operators&p=880636&viewfull=1#post880636
For multi-accounting and collusion, you can't login with same IP or device also we will check users behavior and you can report shady players in support