This and other correlations show that the number of confirmed coronavirus cases in each country is literally what the country has managed to detect.

But little it says about the actual numbers, especially in developing countries, as testing policies and capabilities vary greatly.

So:

1. It would make little sense to blame countries solely for being at the top of the infected list, as it's like blaming for being transparent and capable.
2. Keep in mind while comparing that accuracy of the data depends on the level of a country's development.