This is interesting. They're anti-cheating team seems to really be pulling through this time. Honestly, it doesn't sound like your friends were doing it smart though. There still are ways to get around their system.
I think I got rolled back for a bit or just hacked. I rage staked bank and lost it all then sold everything for 18M and staked to like 75. I logged in (forgot to check recent ips) and it was just gone nothing else just the 75m..