I have a question and i know that you have the answer
I noticed that exchange like Binance for example apply a withdrawal flat fee of 0.0002 BTC (≈ 3-4 USD).
I was wondering how they determine this amount because network fee is not fixed.
For example if tomorrow the network has lot of activities maybe the average of fee will be something like ≈30 USD so transaction with 0.0002 could take days to be completed.
So if this scenario is during for weeks they will update they fee manually ? Maybe they have a periodic review (each quarter ?) of flat fee ?
Thanks for you answers !