A shared source licence still allows commercial use of the software - it just has to be paid for. If it is given away, with or without strings attached, there

A shared source licence still allows commercial use of the software - it just has to be paid for. If it is given away, with or without strings attached, there is no direct way for the developers to be remunerated for their effort. Open source might encourage a few companies to contribute to projects, but that only pays the developers of that software who are employed by those companies. Private individuals, or non-profit institutions, can still use shared source software. A few might be put off if they think it won't help them to find a job, but even they will think twice if companies start paying to use it. Having popular software is nice, but it doesn't pay the bills if you can't charge for it.