Somethings needed to be clarified here, you already mentioned after they made some sudden changes in their terms and conditions, why not you work by the new policies than going by what has been unacceptable anymore, if we are actually following through the updates from these gambling platforms, we may not have issues with them, for the fact that you are well aware for this change alone calls for you to also readjust to their new policies and comply completely with them, they cannot go low with their terms just to please one person when others are doing well with these same changes implemented.
Umm... did you read the thread or were you just reading the title and made your post? The sudden change being referred here is a georestriction.
Poland used to be allowed region, but then after OP registered, it's one of the excluded region, and thus OP's winning was [used to be] cancelled. OP was well aware of this change because his account got suspended. Amuse us and tell us how exactly could someone work by this new policies, to readjust and comply completely, instead of raising a dispute because it's not acceptable anymore?
And if you bother reading above, just two post above yours, you'll learn that the casino acknowledged this error from their side, and technically "go low with their terms" because they're kinda the wrong one here.