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Ideally a union should be working closely with senior leaders to find win-win situations for both employer and employee. An an obvious example would be preventing Andy Rubin from getting a $90mil payday for sexually harassing people. Clearly that's not only a serious injustice, but was ultimately always going to end up public and damaging Google brand.
If the solution is already of economic advantage for Google itself, you simply don't need a union since it is already in the economic self-interest of Google to apply the solution. Employees unionize to have leverage against the employee for topics that employees have an interest in, but are of economic disadvantage for the employer (historically in particular salaries)
This assumes that leadership has perfect knowledge of the situation, which is just never the case. Unions can be an additional source of information about the state of the company, for things that are not being communicated via the usual management structure.
That last point is key: a union exists outside the management hierarchy. There are countless examples of situations which are well known but ignored for political reasons because everyone involved reports to someone with a vested interest in the status quo. A union can be extremely useful for forcing things into the open and doing so in a context where people feel safer commenting because they’re not the only one drawing attention.
How are moral, ethical or legal quandaries EVER of economic advantage to resolve?
Doing crime, cheating, being abusive, generally are more profitable than not doing it, in the absence of consequence. 'The economic self-interest' of Google is to be absolutely monstrous, if and only if it can get away with it.
If the solution is already of economic advantage for Google itself, you simply don't need a union since it is already in the economic self-interest of Google to apply the solution. Employees unionize to have leverage against the employee for topics that employees have an interest in, but are of economic disadvantage for the employer (historically in particular salaries)