All unions end up being political. The elected union leaders are voted and the democratic process compels the leaders take decision that helps them stay in power. This is what causes the problem where you have elected union leader whose values don't align with helping companies bottom line. This will be the slow death of Google as the company we know. Can't wait to see right wing and left wing groups forming within Google.
You say this like it's a bad thing. Instead, we've just been conditioned as "professional" employees to not talk politics in the one place where we have a modicum of control over how resources are allocated in society.
The organization of people around common goals and trying to define those goals is inherently political. Organizations without politics are like unicorns without horns, whether they're nation states, corporations or trade unions. Unions come with all that's good and bad about that.
I don't believe that you can argue in good faith that unions will somehow be the first to introduce political schisms within Google.
