All honest online casinos are licensed
https://spin4play.com/en/casino-rating/ What does it mean? Simply put, their work is regulated by the government of a certain country. To start working in the region, there should not be a ban on online gambling in the country. So, a license is issued by a country or jurisdiction. Countries (Estonia, Great Britain, etc.) issue licenses to projects that will work only with citizens of this country, thus receiving taxes to the treasury. Jurisdiction’s license (Curaçao, Malta, etc.), issued license to the projects, that allows them to work across the globe.