They were advocating for the interests of labor over the interests of large high tech companies. Any success that group attains against Amazon would also damage Google's interests.
Why has this been downvoted? Remember all the stories we've heard about Google refusing to give earned bonuses to employees who shared their salary information? What about the google exec who was blacklisted for the offhand comment that software engineers should probably unionize? We've seen plenty of evidence on HN of this sentiment. Though Google today might have changed its views.
Probably because we have no idea why Google shut down the site - they're not always clear and it's not always obvious.
Stating that Google shut this particular site down because 'they were advocating for the interests of labor over the interests of large high tech companies' is long-jumping to a completely unsupported conclusion.
It might. I don't think it passes the Occam's Razor test, though - given Google, I'm more inclined to go with 'an algorithm did something automatically somewhere.'
It'd be extremely short sighted to stop providing free services for this group, given that (a) they'll make press noise about it and (b) it is extremely easy for them to set up again anywhere else. They're literally just a text web page, they don't need Google site support in anyway.