Is Robinhood app legal?

Could you please clarify whether the Robinhood app is considered legal or not? I've heard different opinions and I'm trying to understand the legal status of this platform in the cryptocurrency and finance industry. Is it a legitimate and regulated service that follows all the necessary guidelines and laws? Or are there any concerns or legal issues surrounding its operations? I'd appreciate it if you could provide a clear and concise answer to this question, as I'm considering using Robinhood for my investment needs but want to ensure it's a safe and legal option.