The horror! I detest that website with my all. It was one of the earliest places I saw a nasty dark pattern. They would bait you to pay to see who viewed your profile, preying on job seekers desperate for a signal that something may come their way. Nasty evil people those!

How do you track gender category when it is not listed or asked anywhere on the forums?

It is as if it is a general rule at this point that centralization breeds corruption. No matter how many statements people make early on in social engagements, centralization leads them to screw people depending on these systems. When making long term commitment to anything, check if it is centralized or how easy it is to unshackle yourself from it.