What world are you living in?
For instance, if person A says “there are people who believe the Earth is flat” and person B denies they exist, the latter is living in a bubble because they are unaware of other widespread ideas (regardless of their accuracy or lack thereof). Person A doesn’t need to believe or agree with a viewpoint to understand there are people who do.
I have met people who would reject the website for that reason and those who wouldn’t. By all means, discuss and disagree with it, but don’t close your eyes and ears and deny their existence. If you don’t realise both camps exist, by definition you are the one in the bubble.
Which I don’t fault you for, because to an extent we all live in bubbles. It is impossible for any human in one lifetime to be aware of all different realities. The very fact that we have access to HN and choose to comment here already places us in a bubble which excludes most of the world. Every other facet of our lives puts us in different bubbles of different sizes for different contexts. To believe oneself immune to or devoid of bubbles falls somewhere between the naive and the arrogant.
Hence you believing that only including M/F as gender options is something that would greatly affect the success of an app.
That is flat out not true. I promise you the vast majority of the world, or even the vast majority of the anglosphere do not care. People like the OP from other cultures do not even understand what you are talking about. Only your bubble believes it to be relevant.
These people dominate every other discussion online and it makes me like his site even more if they’re not there. Most people feel the same way as me.
Consider it a compliment that transgender and nonbinary people are considered wise enough to stay off such sites.
What you are referring to is sex.
Why be so adamant about it? It’s not like you built a dating service. The website has a shady vibe in general, I expect most women will be put off by the very thought of outing themselves to thirsty creeps.