That’s really an overly exaggerated statement echoed on the media: The survey is not a global survey on Paypal users (even if it is delimited to the USA), but rather subject to Mizuho Securities USA customers, as is inferred by the references left below, and carried out on 380 "users" (stated on Coindesk’s link).
This one is just as credible as the ones stating 20% and 18% of the population of Turkey and Brazil owning
BTC, I remember I end up with something above 500 million users just for the countries in the top 20.
I wonder what users they targeted when they did this survey, under 30, member of a bitcoin group, employed by a company that works with crypto projects, and who has a
BTC tattoo? I doubt this number would be real even if we check the users on this forum, but once you leave the crypto space it might be safer to cut that zero.