My understanding is one of mullvads primary owners and creators donates a significant portion of their country's far right party's annual budget. Their policies, last I checked, included things like remigration or the forced expulsion of citizens based off of arbitrary and immutable characteristics (think bloodline or skin color). They're akin to the AfD or Republicans. Theoretically a meaningful % of money spent on Mullvad goes to a person actively trying to make the world worse, like Elon Musk or JK Rowling.

So some people, including me, stopped supporting mullvad until the person is completely financially and influentially disconnected from the company.