the data is only from a small group and they are investors to begin with so 2% can be a correct value. but it in no way represents the whole population or the whole world. when you look at a larger scale then it does not even reach 1% and so far the data (which is from 2017) was during one of the bigger bull runs that bitcoin had and lots and lots of pumps, hypes, advertisements of altcoins which attracted investors even for a short time.
This argument isn't going to help when it comes to the world of polling, as all polling is done like this in order to find out information. It would make no sense to attempt to poll hundreds of millions of people when you're going to be able to get close to the same data through the use of a couple thousand people.
with a country as large and as fast as the United States with a total of 2% investors is a very small amount, and I personally do not really believe in the news or news.
And why is this? I think this is because people don't WANT to believe the facts.
Bitcoin creator "Satoshi" has 3 million to 5 million Bitcoins
And?