What is deribit – crypto exchange with no fees?

Could you elaborate on the nature and operations of Deribit, which is described as a crypto exchange with no fees? Specifically, how does Deribit maintain its business operations while not charging transaction fees? Is it subsidized by other sources or does it rely on alternative revenue streams? What are the key features and benefits that Deribit offers to its users that make it stand out in the competitive crypto exchange market? Additionally, are there any limitations or drawbacks to using Deribit that potential users should be aware of?