I think I read about BC.Game bankruptcy in the news before. I didn’t realize it was because of this case that they declared bankruptcy and simply switched jurisdictions.

https://www.curacaochronicle.com/post/main/curacao-court-declares-bankruptcy-for-blockdance-and-small-house-amidst-unpaid-player-claims/

To me, it’s clear that if you won your case in court, you must have provided enough evidence to rightfully claim your winnings.

Regarding the SSO option, it’s very easy to accidentally click on “Sign in with Google.” It has happened to me several times on other websites too.

As you mentioned, you never played or used any bonuses on that account, so this really feels like an excuse to deny your withdrawal.