Who is Phemex?

Who exactly is Phemex, and what makes them stand out in the world of cryptocurrency trading? Are they a new entrant in the market, or have they been around for some time? What kind of services do they offer, and what sets them apart from other exchanges? Additionally, what measures have they taken to ensure the security of their platform and the funds of their users? Finally, can you provide any insights into their reputation and any notable achievements or milestones they have accomplished?