The real reason is very clear to me: Wolfram builds a fairly unique and complicated product. Their advantage comes largely from a very narrow market with few co

The real reason is very clear to me: Wolfram builds a fairly unique and complicated product. Their advantage comes largely from a very narrow market with few competitors. Releasing the source would deprive them of that advantage, which has financial implications. The benefits of additional contributors might not outweigh the potential loss from competition. The article is a typical critique of open source generally, and one can debate how true or false each point is, but it's not relevant to the real reasons. It's just a smokescreen over "we'd think we'll make more money this way".