I would argue that capitalism does not favor this "concentration of power," in fact quite the opposite. Most industries where there is huge concentration of power (i.e. banks) is largely due to regulation. These new SV companies disrupted other big businesses and will eventually be disrupted by another wave of businesses themselves. A look at the top 10 companies by market cap in 1995 is probably very different than the top 10 currently.
I'm not sure how you site "exploitative practices by big business" then give an example of Uber. Uber is % of cab services? I would not classify them as big business. And while you might have a point with Google and privacy, users are not their customer but rather their product they sell to advertisers. So to argue they use exploitative practices and comparing to Amazon is weak considering the users aren't really a part of the supply chain but rather opt-in voluntarily.
I'm not sure how you site "exploitative practices by big business" then give an example of Uber. Uber is % of cab services? I would not classify them as big business. And while you might have a point with Google and privacy, users are not their customer but rather their product they sell to advertisers. So to argue they use exploitative practices and comparing to Amazon is weak considering the users aren't really a part of the supply chain but rather opt-in voluntarily.