That's a gross misunderstanding of how a union works. This is pushing anti-union propaganda borne of personal biases.

ie Blizzard's CWA - it's scary to think about for many workers, so most people didn't bother to look up the details.

Auto workers in Detroit probably wouldn't agree with you. They had a union. Now they have no industry.

The Taft-Hartley Act implements plant level unions in the US, unlike unions in Scandinavian countries that negotiate at the industry level.