Was that in the article somewhere?

At any rate, there's some fine line where an activity that could otherwise be described as a hobby becomes work. It's the actual activity + intent + context + judgement of the authorities that matters... Presumably when you essentially establish residence, get paid, hire and manage other people, that line has been crossed.

Because clearly him spending his money there instead of somewhere else is a net negative for the country?

Here's the source for who he hired to work for his company: https://twitter.com/levelsio/status/389171438013267968