Hello,
I'm struggling to find decent numbers related to the turnover generated by crypto exchanges. Unfortunately, the only one showing exact figures is Coinbase (whose structure is actually uncomparable).
I even tried to read old whitepapers wrote by teams who wanted to launch an exchange: 0 figures for revenues.
Knowing revenues per user is impossible. You can only get total revenues either on a certain period of time and/or a certain pair, and I guess it is the nearest possibility of data that you can obtain. UNLESS, you partnered nor sent a formal letter to certain exchanges and good luck if they would let you have Revenue/perUser as it can be a vital piece of information. I guess directly contacting exchanges is your better option. Even data scrappers might not obtain such data. And also consider the volume of an exchange, the bigger it was the harder you can extract it.
If you are then looking just for an actual estimate given publicly by exchangers, then you will really find nothing, as even exchangers themselves cannot really track revenues of course with the volatility of coins plus the activity of traders.