I have trouble believing 9% of the US population owns crypto.
Thats 30 million people. Coinbase has 11 million active users including a large proportion of foreign users.
They surveyed 29,000 people from all over the world who are internet connected. That's actually considerably more than the average survey but still a pitifully small spread. A significant proportion of Americans probably believe the internet harbours Satan.
I've never understood why anyone pays attention to surveys unless they personally visit every single person in the country. Pollsters can kiss my silky buns too.