Back in 2014 Tesla offered up access to all of their supercharger related patents for free, but anyone who wanted to take advantage would have to agree to never

Back in 2014 Tesla offered up access to all of their supercharger related patents for free, but anyone who wanted to take advantage would have to agree to never attempt to enforce any other patent against Tesla or against any other company using your technology to make electric vehicles. So obviously no one used it because "give out free access to all of your future electric car technology forever" is a pretty shit trade for "we'll share our couple year head start on charging" in the long term, and now we have incompatible charging networks.