I mean, in the late 90s everyone was talking about how the Internet would "democratize information", because anyone could become a content publisher from their garage. The story then was about how "the power" was concentrated in huge media companies, and the Internet would change that.
But when the barrier to entry is tiny, and indeed the barrier to switching is so low, it means that any competitor that is even just a tad better than the other guys will vacuum up all the business. It's indeed actually this more open framework that leads to higher concentrations of wealth and power, not the other way around.