Among the three big companies, I would like to choose Walmart and Amazon. Their ecosystems will be boosted with Bitcoin adoption and later adoptions for top altcoins. People will use their Bitcoin (better if they integrate Lightning network payment gate) and altcoins for their expenses/ checkouts on Walmart or Amazon.

Why I don't choose Apple? It is basically from their core approaches with which they only want to shill Apple products and try to force Apple users to use as many products from Apple as possible. They don't want to corporate or shill products of others.

If Apple accept Bitcoin, they will be one of the latest big tech companies.