Earlier quoted context omitted.
Even if unions are affecting no change, their are able to give the workers at least some power. Who knows, maybe they'll make Amazon to allow unmetered bathroom breaks one day.
Bathroom breaks aren't metered in Amazon warehouses.
It literally is considered time off task (TOT) when you stop for a restroom break outside of your scheduled break times.
There is always the option for people with increased medical restroom needs to seek specific accommodations to essentially excuse the TOT for their needs.