So Amazon bad, Costco good?

The two companies are super different in their corporate practices, to their customers, to their suppliers, and to their employees. There is a material difference despite them both being American multinationals. I'm also buying local Canadian foods from them. Grocery chains in Canada are an oligopoly as well, so just moving to Loblaws, for example, would only be a marginal improvement in my view. It's important to have some nuance in this discussion, and I'm changing my habits a bit at a time.

Yes it is has been difficult to replace it all. I review once every few months what I'm subscribed to and whether it's worth it. (Airline gift cards alone offset the cost of membership for me). It's also been tough to keep track of if a Canadian brand got bought by the US in the last few years, or if a US brand produces stuff at a Canadian factory. I'm not perfect, but I don't think I'm the only Canadian who evaluates their consumption choices and look for alterantives where available. That's the whole point for me being transparent about where I still am tied to US companies in my last comment, so thank you for raising it.