[aplusbi]

I worked for a while on a dating app (that was never released). It had over a dozen gender options and allowed selecting more than one gender. In the case of a dating app allowing multiple genders wasn't just about inclusivity, it was also practical - a non-binary person might want to also be classified as male or female for the purposes of a dating app, for example.

But in any case, it's the context that matters. Most of the time you don't need to know a person's gender so just don't ask. Many other times gender is just a proxy for something else, such as a person's title. It's better to just ask for their title than their gender.