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A union authorization card does not “join” someone to a union, nor is it an irrevocable endorsement of “whatever the union will say in the future.”

A union authorization card is simply a means of demonstrating the 30% employee support required for the NLRB to order an election. That’s it. Unions will generally not hold elections until 60% of employees have signed cards, because a majority vote is required.

From the anti-union National Right to Work Foundation:

“You have a legal right to revoke any union authorization card that you have signed. It is illegal for a union to restrict your right to revoke a union authorization card that you signed.”

https://www.nrtw.org/rights-card-check-private/