Because sometimes the government can use its powers for the good of the general public, even if it negatively effects business. How negatively Tesla would be impacted is debatable - I don't think anyone would expect them to be forced to let people use their chargers for free.
I dont think people would put up with a gas station that only fueled Toyotas, or a parking lot that only allowed Fords. This doesnt strike me as being terribly different.
I honestly don't understand this sentiment.
Tesla invested many many years creating a charging network in a competitive environment that actively resisted it. So now that Tesla is super successful in part because of this long-term investment, how is it fair that Tesla _must_ open it up to the _same_ people that resisted them earlier?
That's like Apple being forced to give up their Lightning specs to third-parties because they invested years of R&D into creating a fast plug-and-play standard before USB-C gained a foothold.