From this week’s Economist:

As big tech’s scope expands, more non-tech firms will find their profits dented and more workers will see their livelihoods disrupted, creating angry constituencies. One crude measure of scale is to look at global profits relative to American GDP. By this yardstick, Apple, which is expanding into services, is already roughly as big as Standard Oil and US Steel were in 1910, at the height of their powers. Alphabet, Amazon and Microsoft are set to reach the threshold within the next ten years.

Remember what happened to Standard Oil and US Steel?