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Sweden (like many other countries) engages in sectoral bargaining where trade unions or labor unions make a collective agreement that covers all companies in the sector. Trade unions form confederations demarcated by occupation and they negotiate with their counterpart employer organisations to get deals that cover most of the sector. In other words, there are existing labor agreements from multiple sectors that cover millions of workers.
Tesla has the bargaining power is fly shit against unions and confederations that represent 80-90 percent of the Swedish workforce.
Tesla claims that 90% of their employees in Sweden have refused to strike, but that figure seemingly includes office workers and others who would never have been part of the metalworkers' strike to begin with. The union itself claims about 50%. [0]
[0] https://da.se/2023/11/sa-manga-strejkar-pa-tesla-if-metall-g...
Which is kinda why the strike is from other workers in other companies.
Given PostNord's less than stellar efficiency, this could be entirely unintentional on their part :-)
0: https://www.business-humanrights.org/en/latest-news/sweden-s...
I think you are missing the point here. You seem to be basing your expectations on one union by how another union behaves. I have no idea why they do what they do, but this is not some kind of US hate thing - that's a bit far-fetched in my opinion.
Ask yourself this: Where you live, is the culture and history of a union representing metalworkers the same as those that would be representing someone from Spotify? In most countries, unions in different areas act very differently. Programmers, metalworkers, miners, academia - their unions are more often than not very different.