[Frondo]

A google union, or any tech union, can arrange whatever compensation scale it wants. Every union is a democratic organization, structured however its members want it to be structured.

There is no reason a tech union would have a strict seniority-based pay scale.

A tech union could do things like insist on better work/life balance, a seat at the board representing worker interests, you name it. A google-specific union could insist on bringing the 20% "work on your own thing" scheme back, for example.