That's an incredibly uncharitable insinuation. Do you think community organizers do it for the money? There are a lot of reasons people choose to advocate but regardless of weather you think they're right they generally do it because they actually believe in something. It's unlikely fighting Amazon is a very profitable venture.
They certainly do it for the power (the majority of them). Very few people put themselves in that position without an eye for moving into politics to continue their power growth.
Remember, the vast majority of people do not do things long term for altruistic reasons.
I mean, judging by some reporting[1] it sounds like the final meetings involved a framework for unionization efforts which to Amazon was probably unpalatable enough to pull out entirely just based on that.
I guess if you consider "working with the community" to equal "greasing the local union bosses" then maybe. But it's just more logical to just imagine that Amazon doesn't want to exist a blueprint for other unionization efforts nationwide.