Some of them have approval from the MGA or UKGC, which are the strictest authorities globally. https://dnska.cz/index.php?domain=sparize.com%2F%EB%A8%B9%ED%8A%80%EC%82%AC%EC%9D%B4%ED%8A%B8-%EC%8B%A0%EB%A2%B0%ED%95%A0-%EC%88%98-%EC%9E%88%EB%8A%94-%EC%A0%95%EB%B3%B4%EC%99%80-%ED%8C%81-%EC%A0%9C%EA%B3%B5%2F