Idea: Service of finding partners / partners / groups for different purposes

Sometimes someone needs to find a person for some purpose:

Find people in a fitness group to get a good group discount.
Find a partner or partner for dancing (where you need "your" partner)
Find someone who wants to travel / go to a place
Find a native speaker who wants to learn (and who is learning your native language)
Find people who can play any musical instrument (if they are needed in the group)
Find a neighbor to share an apartment
Find models or models for artists, sculptors, or photographers
Find a girlfriend with a stroller for joint walks (they are 5-7 km. With a stroller)
Find a sparring partner for boxing, or fencing (or another pair of sports)
Find players or masters for collaborative play (“rollers”, “auto-watches”, etc.)
And so on.

The idea is to make a website that allows people to find each other.
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Monetization .
You can get money in fairly simple ways - because we have a clear audience (even if there will be 20 main thematic headings), you can target the advertising of goods / services to these groups. Under the headings "photographers" advertise props, equipment, and graphics software and services; in the group of "trips" - tickets, equipment, in the group of "girlfriend with a stroller" - products for small children and young mothers; and so on.

An important feature of the service: it should not be biased towards "Dating" and "Work." For these purposes, there are quite a few sites - mambas / lapplanets, freelancers.ru, and so on.
And it is important for the described service to maintain positions in its niche, completely covering it. And only after that, thinking where to develop further.

Actually, that's the idea. Like my other ideas for projects, it does not have “copyrights”. If someone wants to embody it - well-meaning.

Opinions and additions will be glad to hear.