He blocked users in the US for some other inane reason a year or so ago. Treefinder (the software in question) hasn't been updated for several years and has been surpassed by other (better) tools, anyone still using it would be doing so out of habit rather than it providing any insightful edge.

It seems Jobb is ignorant and racist, and this article has no tangible scientific angle - it's just stirring up controversy.

It's also totally unenforceable as it violates EU Law and German Law