What type of not "legit" trading do you suspect?
Coinbase has 100M customers and less than $1B daily trading volume. $10 per customer per day does not seem unusual. It is an average of less than $4000 per year.
Coinbase has 100M customers and less than $1B daily trading volume. $10 per customer per day does not seem unusual. It is an average of less than $4000 per year.