Yes, not having a union can lead to more abuse.

However having a mandatory union can lead to abuse too. Because it gives all the power to the union. You never want to give all the power to one entity. This basically creates a workplace mafia.

What you want in the workspace is to have several unions that can work together (or not). The more unions, the better (because it’s easy to divide two unions, but harder to split seven).

Those unions ought to federate workers from widely different industries, so that they can carry the weight of many voices technically and politically.

Ideally, there ought to be some kind of legal infrastructure for the corporations and the unions and representative bodies of the workforce to periodically meet and update their generic contract.