Open Source, and Free Software paid a lot of attention to foundation, on which their software was being built. You can think whatever you want about RMS rants

Open Source, and Free Software paid a lot of attention to foundation, on which their software was being built. You can think whatever you want about RMS rants about Java, but he and FSF sure did paid attention to the fact, that they must control everything, turtles all the way down, as much as possible. Otherwise, just one proprietary, non-replaceable layer in the stack, and the layer owner can control you.