I live in a dense European city and I don't know a single person who orders groceries online.
I live in the U.S. and have almost never used a service like Instacart. Also, when I see the item I’m trying to order in Amazon is fulfilled by Whole Foods, I typically don’t buy it, because of the additional cost.
I’d rather suffer a small amount of inconvenience to save several dollars on groceries, and often it may mean that I may need to order a different brand to pick up a similar item at a local store.
However, I’ll gladly pay a little additional money for Amazon for many other items, because it’s convenient, shipping is included in Prime, and because I can get what I want.
I make the majority of my retail purchases at a supermarket, followed by Amazon online (Prime only), then a very small percentage in-person at Target, Walmart, or a hardware/home supplies store or some random online retailer.
The best I can do to “shop local” is to use a supermarket chain; there is no mom-and-pop to support that isn’t a chain unless it’s a restaurant. I don’t pretend that this is actually “shopping locally”.
I’ve only participated in a boycott once or twice, because there is typically a practical reason for shopping when and where I do- either I need to shop then because I don’t get out much, or there’s a sale with actually lower prices, rather than the frequent “increase the price just to cut it to get you to order more” thing, which I also get sucked into, because I don’t have time to price shop, unless it’s with camelcamelcamel for Amazon.