as I got it some part of coins will go from miners to MinexBank. How large is that?
Blocks 1 - 900 001 = 20%
Blocks 900 001 - 1 800 000 = 30%
Blocks 1 800 001 - 2 700 000 = 40%
Blocks 2 700 001 - 3 600 000 = 50%
Blocks 3 600 001 - 4 500 000 = 60%
Blocks 4 500 001 - 5 400 000 = 70%
You can read more
https://minexcoin.com/html/download/wpeng.pdftnx, I got it and in accordance with this document it will be stable 20% starting from block 5 400 001.
Do you think miners will agree to pay 50 - 70% for the mining licence? But on the other hand such progressive payments will restrain the difficulty increase
The increase in complexity does not depend on the percentage of deductions, but on the profitability of mining in absolute terms (in fiat currency). Let's assume that the MNC by 2025 will cost $ 500. By this time, deductions to Minexbank will amount to 50%. Do you think that the complexity will increase if, at 20% of the deductions at the initial stage, the price of the MNC is $ 20?