Nobody knows.
This information isn’t available.
Most brokers are either completely unregulated or regulated only as a pretense by regulators who don’t limit permitted leverage at all.
There’s a huge turnover of traders and accounts with high leverage.
They’re mostly gamblers, not traders, so it doesn’t mean anything.
Among successful traders, a very small minority, the average might be between 30/1 (Europe and Australian regulators) and 50/1 (USA).
But that’s such a small minority of people that it can’t shift the balance much.
Many people try 1000+/1 leverage.
Those accounts don’t usually last long, but some people try repeatedly.
So the true average leverage figure wouldn’t mean anything, even if it could be found out.
Why do you ask?