What are the disadvantages of MoonPay?

As a cryptocurrency enthusiast, I'm curious about the potential drawbacks of using MoonPay. Could you elaborate on some of the disadvantages that users might encounter when utilizing this platform? For instance, are there any concerns around transaction fees, security vulnerabilities, or limited payment options that users should be aware of? Understanding these aspects would certainly help me make a more informed decision about whether MoonPay is the right choice for my needs.