The author should also do a quick search (perhaps with bing, DuckDuckGo, or Yahoo) on PayPal accounts being blocked. He recommends this as the safe option, trusted option, but I have seen more PayPal banned for life rants than google ones. With PayPal you can loose your account just because your customers are using stolen cards.

The lesson should be that basing a business on any single external resource could be an issue, and you should approach it carefully.