Can I limit the features of the service for users based on the qualities of their personalities?

Question

Documentation

I plan to create a dating service. Initially, I thought that there is a certain list of questions about their personality that the user is required to answer, such as gender, age, "married / not married", "do you have children", "what religion do you follow?", height, weight, etc. If you do not want to answer all the important questions, then registration is not available.
The question is, do I have the right to do so? Wouldn't this be discrimination under the law (Russian and American)? Or should I give everyone the opportunity to register indiscriminately, and then motivate them to fill out the questionnaire as completely as possible? Service for adults, so that the age of any must be indicated. There is also no point in users who refuse to indicate their gender, since other users are unlikely to be so tolerant as not to have a preference for the partner's gender)) But is the obligation to indicate gender discrimination with legal consequences? Married status is also a rather critical issue, since one of the basic ideas of the service is that people should not be married or in a relationship (I didn’t think of ashleymadison here).
If, however, the questions are made optional, do I have the right to restrict these users in the functions of the service (for example, hide the profiles of those who did not indicate the status of marriage from the search for those users who strictly want unmarried people)? Or hide those who did not indicate religion from the search for those who strictly want an atheist wife?)
I think that users who do not answer questions, even such basic ones as indicating gender (if I cannot filter them from the rest) will bury the whole idea of ​​​​the service.

Answer 1

Position the service as a closed club and write down what you want in the rules. Well, there are a lot of sites where you can register only by entering a mobile phone number and receiving a confirmation SMS on it. No one sued them for discriminating against the owners of only a landline phone with a mechanical dialer.

Answer 2

TS - what side does the "documentation" tag relate to this issue ???

Answer 3

For the public, no.
You can't restrict shopping to Negroes or pimply women there.
But if you have a private club that is closed to free access, then this is a different matter. You can even go naked there. And in a public place, they would get caught "for hooliganism" according to the law.
It's all about how membership will be arranged.