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This is one bad side of Sybil check there has never been anywhere that this tools use are most accurate most at times they might caught a wrong person, I don’t I have seen casinos that actually will boast that there Sybil checker tool is most accurate that’s why they always provide the options for the players caught wrongly to actually appeal and if the proven wrong they simply apologize sits well with me. Sybil checker tool are usual front-end tools for onchain analysis and this is definitely going to pick out some linked accounts which might not be Sybil.
Sometimes, I see apologies stated with similar IP address or matching patterns, which means the sybil check algorithm might be relying on patterns that feels two things are connected because they have similar patterns or have similarities hence it flags them as one or cheater, this is one of the reason why don't use several casino because they could even scam you with such alligation, especially when there is an insane amount of win or huge deposit in your casino wallet/account. I also agree that because they are aware of this vulnerability of their checkers they leave the window open for those who will not find it likely to let go.