Could not recent trends (not this one specifically) be construed that way? For example, you can now run bash on Windows. What if Microsoft introduces extension

Could not recent trends (not this one specifically) be construed that way? For example, you can now run bash on Windows. What if Microsoft introduces extensions to bash that bash script writers would be tempted to use if they were targeting Windows? And if they implement it in such a way that they are not obliged to publish the source (or, they publish the source, but it calls into new Windows syscalls and so is useless on other platforms)? Now you've got windows bash and standard bash. The new features are genuinely useful, and windows bash flourishes. Then, five years later, they start breaking backward compatibility. People have to choose a side, and maybe they decide not to be compatible with standard bash anymore. We might be at the point where Microsoft doesn't have the clout to do this, and for the moment I'm happy that you can run bash on Windows - but the millisecond that I see them introduce a single non-standard feature to bash that they don't contribute back under GPL or whatever, I will resume yelling loudly to anyone nearby about EEE.