Nordic unions underwrite the cost of strike action and pay workers any lost wages that result.

There's a statement by IF Metals (the central metalworking union whose ~130 odd members are being refused a collective agreement by Tesla) that they'll support their workers through this. I would image that postal and dockworkers see similar support from their unions (although they are working on every item save those that go to/fro Tesla and are not affected to the same degree).