Not exactly true, they have been trying to get others to "License" their charging standard. Tesla built a standard and the rest of the industry built a standard (and Tesla refused to participate).
Now to top that Tesla sells an adapter so that Their cars can use the Industry standard for quick charge, but refuse to sell the licence for their standard to be used in an adapter that allows others to use their chargers.
So in simple terms, their "trying" has been wanting to get a kick back for every car built, Not actually removing barriers for within the industry.
Again as a consumer and end user, i'd buy an adapter and pay to use their chargers if i could, but i can't because the option doesn't exist. Also i'd love to buy their car, but i can't because they do not have anything within my affordability range.