What do we consider a user to be?
Because if somebody is not actively using Bitcoin or other crypto daily and are just storing them on Binance or Kraken then that's no different than calling nobody a Tesla user because he has stocks in it and not because he has a car.
And I'm not buying that close to half a billion number, just look redound you, does it feel like one in ten persons is a crypto user?
The number is way smaller than this, I would even dare to say by an order of magnitude, 40 million sounds way more plausible than 400 million.