How to pay taxes to the self-employed from the income from the freelance exchange Kwork?

Question

Freelance

I'm going to register as self-employed, but I can't figure out this thing.
One of the sources of income from freelancing is the Kwork exchange, where I sell my services and after a dozen orders I accumulate the amount per month on the account of this site (for example, 15,000-20,000 rubles), which I withdraw through this site to my card. It turns out that in my case Kwork is an intermediary between me and the client. I can't figure out how to legalize this money? To whom should checks be sent? To those dozens of customers who buy services from me through this exchange? But isn't it legal for me to send a check to the person who sent me the money? After all, if the Quark platform itself sends me money, and I sent the check to Vasya, is that right? Quark himself says that they do not yet have the opportunity to work with the self-employed.

If it's correct, then I see it like this:

1. Vasya buys a service from me on Kwork for 2000 rubles
   
2. I fulfill this order, generate a check and send it to Vasya
   
3. Then I calmly withdraw these 1,600 rubles from the exchange to my card (the amount, taking into account the Kwork commission)
   

Or not?

Answer 1

Considering the penny sums for which the kwork is designed, I would not even bother. Where is the upwork with an income of 3-4k dollars for the average rower, and where is the quark.

Answer 2

Vasya buys a service from me on Kwork for 2000 rubles

Kwork gives you ~1600 from which you have to pay.
Kwork used to be paid through https://solar-staff.com/ Now I don’t know. They will help with taxes and paperwork.

Answer 3

and what does Kwork say about this, you asked?
Do they have, say, an agency agreement? Like Upwork

Answer 4

Why do you need this hemorrhoid? It would be nice if each customer paid you separately, but here it’s not too big in one amount .. If you really get confused, you can withdraw every month to different cards of different banks. The income is not permanent at all.