They don't have that right now. There is no legal framework yet for demanding a social media company provide you an account. Many of us would like to see that changed.
If you own a Quest VR headset and have purchased games, a ban means you cannot play or download them. I would hope that would be reasonable grounds for a suit in small claims court. If they make membership in the social network a requirement of using a product you purchased, that comes with responsibilities on their end too.