What Grab does
Three sovereigns meet in every Grab transaction: a driver, a rider, and the ground between them. Grab's app is the introduction layer — it knows where the rider is, which drivers are nearby, what each driver charges, what route to take. The match is real value. Without it, the two sovereigns would never find each other in the time window the rider has.
The same shape extends to food delivery (restaurant + eater + courier), to payments (sender + recipient + settlement layer), to logistics, to digital banking. In every case the sovereigns are real, and the matching function is real, and Grab's app is the connective tissue that lets them find each other.