What flight controllers do commercial applications use?

I’m curious what physical flight controller hardware the commercial applications of the px4 use? I’m referring to this page where there are different systems listed. They are very diverse, but Draco for example has too small of a platform for any of the flight controllers available on the market. How do they implement their product using PX4? I’m mainly asking because I’m looking to get into the hardware side of drones more.

I know Teal has everything including the ARM for PX4 and even a Tegra chip integrated on a single PCB, maybe with a daughter board IIRC. Wires, connectors, and cases take up a surprising majority of space and mass.