Amazon is very much not a monopoly. There are thousands of online retailers. There are also a lot of delivery services, no idea if there are thousands, but there’s a lot.

Is there a country that you’d consider a good example of this?

Where did this meme of “capitalism requires infinite growth, therefore it’s impossible and bad” come from? Capitalism doesn’t require infinite growth, the universe has basically infinite resources, modernity which is largely but not exclusively caused by capitalism has allowed us to do so much more with fewer resources than generations previous, and as societies get richer in material wealth they produce fewer children and have the luxury to pay attention to things like the environment and their impact on it.