To be clear, this is the government-owned postal service that does the deliveries of these license plates. They have other privileges on account of being the official postal service.

There are other legal consequences to not bargaining and signing a union contract in Sweden, this is quite simply the way the Swedish labour market works.

Other companies have been de-facto banned from the Swedish market before by refusing to bargain in the past (Toys'R'Us for example), I don't see why Tesla's case would be any different. Were I to be a judge to receive this case, I would question why Tesla would refuse to do something so mundane and universally expected as to bargain with the unions. Upon not receiving a good reason as to not do it, I would then promptly throw that case into the trash where it belongs.