First, let me start by saying I'm not much into betting, and especially not into sports betting. To me, it always looked far too arbitrary as for which rules apply.
The group targets sportsbook which has less limitations and takes advantages of the odds.
Why would that be a problem? If a casino offers favourable bets, what's wrong with using them?
Isn't that what's called arbitrage betting? I've never done it but I feel like it's a legit way of minimizing potential losses. Let's say this is a group, as long as they all go through KYC that proves each account is owned by a different person and they simply communicate to place bets together, that's being smart, not cheating.