232 million PayPal accounts; that website says 100,000 in dispute (looks suspiciously round), so one in 2,320 accounts is in dispute. When you get into the realm of big numbers, even an apparently large number of disputes is actually pretty trivial.
And it's possibly not the most impartial site, given that it would be a surprise if they were not getting referral fees for their incessant links to the "Free Merchant Account". I'm not saying they are, just pondering aloud...
All I'm going to say is that neither I nor anyone I know has ever had a problem with PayPal.
Vin