I guess that speaks about the scale at which they are operating in Google Cloud. Diane Green mentioned in a recent conference that one of their healthcare customers collect about 2 PB / user. Lot of companies struggle with managing / extracting value from data. Thats where the bottle neck is usually. If they have capability to handle more data, overtime their services evolve to collect, store and process more data. Once Big Data became reality, many companies started collecting orders of magnitude more data. With Google Cloud its easy to handle petabytes of data. That enables large scale computing companies on Google Cloud. (Think of driverless cars / genomics / large scale machine learning / social networks / ... )