And I suppose Apple has also made a healthy profit, either directly or through licensing on each of the purchases?
I mean, a bunch that just have the no-name plastic-bag packaging probably slip by on Amazon, but I would assume the lawyers wouldn't let you brand your cable "thunderbolt" without some official licensing fee process.
You just made this up. As already clarified in this thread, Apple doesn't own Thunderbolt and Apple gets zero (0) licensing fees. There is no "cut".
Even when there's no money in it, Apple uses whitelists in some places, like which SSDs get TRIM and which displays work and get the HiDPI checkbox:
https://support.apple.com/en-us/HT206587
Who owns a standard doesn't seem to matter at this point.