I have found that it is common in Poland to do multiple PhDs:

• dr. hab. Piotr Sankowski, CEO @ IDEAS NCBR, Associate Professor @ UW, Warsaw, PL

• dr. Jarosław Duda (Jarek Duda), Assistant professor @ Institute of Computer Science, Jagiellonian University, Krakow, PL

and, these people are very successful.

There are lots of posts in Academia.SE describing the negative aspects of doing multiple PhDs.

• Is doing two PhDs a good path?
• Is a second PhD ever necessary?
• Why is having multiple PhDs frowned upon?

As far as I realize, most of the answerers are US-based.

My question is,

• Is the notion of multiple PhDs are bad for a career either in the industry or in the academia applicable only to North America or is it applicable to the entire OECD?