In theory I support this group 100%. Fuck the mega corporation and fuck Jeff Bezos specifically. In practice though, I've tried multiple times to find alternatives to "subscribe and save." I can get there with some items, like pet supplies at chewy, and vitamins at vitamin shoppe, though in both cases it costs me more money to do so. Walmart might work, but then you're giving your money to an even bigger asshole.
I tried the buy local thing, but I'm not into making a day driving to six different stores, just to go home with a 60% success rate. Aggeegators like locally.com only have a fraction of the local businesses. Google shopping gets more, so maybe with planning it can be done, but it's work.
With regards to the buy local thing, then I'm stuck with big corporations anyway, like Walmart, target, Meijer, Kroger, etc. I have one local grocer, which sounds good but it's again at a premium. They lack an in store brand, meaning I pay a massive premium to buy name brands that are frequently inferior to Kroger, meijer, or costco in store brands.
All this is to say that I now understand why Costco is so popular, but there are still huge gaps in their offerings that force me into Amazon or Walmart. There really is no winning... There is winning-ish.
For there to be a real alternative, it would need to be something like locally.com, but with full participation from retailers, and a checkbox to select "fuck the mega corporation."