To answer your question, they did open source their innovations. In the future you should consider not asking rhetorical questions that you don't know the answer to. Also, when you don't know the answer, you probably shouldn't pretend to know. Other people might make the mistake of thinking you are informed rather than a productive citizen of the society which exists in your imagination.
As to why - ICE dealers didn't want to lose recurring revenue streams and ICE manufacturers didn't want to disrupt the means through which they would service the loans that they took out to build out their present ability to manufacture at scale. The incentives were perverse and in some cases still are perverse enough that the ICE industry has to be forced to help kill itself off, rather than dying willingly because it is right.
As to why - ICE dealers didn't want to lose recurring revenue streams and ICE manufacturers didn't want to disrupt the means through which they would service the loans that they took out to build out their present ability to manufacture at scale. The incentives were perverse and in some cases still are perverse enough that the ICE industry has to be forced to help kill itself off, rather than dying willingly because it is right.