So, the four leading tech companies of the current cycle (outside China), Google, Apple, Facebook and Amazon, or ‘GAFA’, have together over three times the revenue of Microsoft and Intel combined (‘Wintel’, the dominant partnership of the previous cycle), and close to six times that of IBM. They have far more employees, and they invest far more. (Once can of course quibble with the detail of this - the business models are different and the global scale is different. But scale is scale.)
This change is even more striking if you shift the timeline. If you compare GAFA in their current dominance with Wintel in their period of dominance, you see not a 3x difference in scale but a 10x difference. Being a big tech company means something different now to in the past.