Earlier quoted context omitted.
So you don't use any proprietary technology then? What kind of car do you drive?
Of course I do. But I avoid it whenever it's possible and active advocate for non-proprietary alternatives.
I think that I understand why someone would wish to exclude all proprietary technology. No advocacy is the best advocacy though. If the product is so great, it sells itself. It does. People use 'nix all the time for the things it's good at and then they go use other stuff too. Hostility towards that "other stuff" really works against the cause IMO. Why not spend the same time an energy to make the product better? Then people will just use it and nobody will have to argue about it.