Same reason so many people got excited in the early Internet days of how much work and effort could be saved by interconnecting everyone. So many jobs lost to history due to such an invention. Stock trading floors no longer exist, call centers drastically minimized, retail shopping completely changing, etc.

I had the same thought you did back then. If I could build a company with 3 people pulling a couple million of revenue per year, what did that mean to society when the average before that was maybe a couple dozen folks?

Technology concentrates gains to those that can deploy it - either through knowledge, skill, or pure brute force deployment of capital.