Where is dYdX legal?

As a cryptocurrency enthusiast and investor, I'm often faced with the question of legality surrounding various decentralized exchanges. One such platform that has caught my attention is dYdX. Given its innovative approach to trading, I'm curious to know where dYdX is legally recognized and operational. Is it available globally, or are there specific jurisdictions where it's been given the green light? I understand that the legality of cryptocurrencies and their trading platforms can vary from country to country, but I'm hoping to get a general overview of where dYdX stands in terms of its legal status.