This is ultimately the most important distinction between platforms and Aggregators: platforms are powerful because they facilitate a relationship between 3rd-p

This is ultimately the most important distinction between platforms and Aggregators: platforms are powerful because they facilitate a relationship between 3rd-party suppliers and end users; Aggregators, on the other hand, intermediate and control it. Would YouTube count as an Aggregator? Are they becoming less about the task to "facilitate a relationship between 3rd-party suppliers and end users" and more about seeking to "intermediate and control?"