IE as long as the workers don't form an local chapter everything is fine the problem if that when such a chapter forms and the company ignores it every other union chapter is allowed to refuse to deliver work in support of an company that choose to refuse/fight unionization.
So for there to be an conflict there have to be an meaningful chapter formed within tesla's employee base that tesla refuses to acknowledge.
Now again remember that this system is core to the "flexsecurity" systems employed by all of the nordic countries which is generally based on fair negotiations between equal parties(union and company) if Tesla manage to break that model they force the bureaucracy and state to take over and set highly rules without any concerns for local details they way it typically happens in France which is going to hit their profitability far harder then allowing unionization.
Again the "laizes faire" no labor protections of America just don't exist in Europe the question is weather you negotiate with an equal partner made up from your own employee's or have the state bureaucracy micromanage local details.
And while lots of companies work without a CBA here in Sweden, 90% of employees are covered by CBAs, so the vast majority are covered by one and Tesla fighting this by bringing scabs (a huge, huge no-no in here) is quite stupid. If they thought a CBA would be bad for business then strikes are even worse, it's their choice now to sign one or not with all the costs associated on not having one.
1. https://teknikensvarld.expressen.se/nyheter/bilbranschen/tes...