• That’s their goal. They have good intentions. But it also means no commercial use.

      You can’t do “Hey, can you add this feature to this app, I’ll pay you” or “Here is much improved version you can buy from me” or “We give you paid support and help for this software for your company”. Eventually all improvements bounce back to original creators anyway, see: vital paid Wordpress theme ecosystem, most of them being GPL licenced.

      With project getting bigger such restriction can be almost as bad as with propietary app. Like, imagine Linux kernel but only with Linus Torvalds having right to sell computers with it or offer any services making money.

    • You can not modify the source code.

      you are not entitled to use or do anything with the code for any commercial or other purpose, other than review, compilation and non-commercial distribution in accordance with the terms of this license.

      “review” means to access, analyse, test and otherwise review the code as a reference, for the sole purpose of analysing it for defects.