Japanese cryptocurrency exchange Bitbank warns that transfers linked to prediction market platforms, including Polymarket, may lead to account restrictions or suspensions. Multiple reports say Bitbank issued a notice advising customers that such transactions could be viewed as related to activities covered by Japan’s gambling regulations. The exchange’s position is presented as a compliance measure amid continuing regulatory uncertainty around prediction markets in Japan. The reports indicate that Bitbank is not only monitoring typical trading activity but is specifically flagging fund transfers connected to Polymarket-linked activities. According to the coverage, users who proceed with these types of transactions should expect potential account limitations. While the outlets describe the same core steps—Bitbank’s warning, the reference to gambling-law risk, and the possibility of suspension—the details are consistent in that the action is precautionary and tied to how Japanese authorities may interpret prediction market participation. The reporting does not provide new changes to law, court rulings, or guidance from regulators, but instead focuses on Bitbank’s enforcement posture toward customer transactions.