Yes, including Whole Paycheck[0] as well as Trader Joe's and Safeway and Von's and everybody else.
While I can imagine Amazon having a loathing of unions, if they really want to be in this space they will sooner or later have to contend with the fact that this is an industry that needs a union. And I think, at obvious risk of being wrong, that the US is going to become once again more union-friendly in the coming years.
So maybe a very friendly, not very confrontational, laid-back and smiley group of workers flirting with unionization might be a way for Amazon to put a toe in that water without overcommitting. Much as the WholeFoods acquisition was per se.
[0]: Whole Foods goes by this nickname in California. Because you spend your...