> If only it were that easy to completely rule out third-party risk! For one thing, some ecosystems are so complex that it is far from clear who is responsible for what.

Bullshit. Nobody forced you to use sub-sub-subcontractors.

And the idea that some ecosystem is too complex for Facebook is laughable!

If an ecosystem is too complex for you, a smaller company, stay away! I don‘t do deep-sea diving. So you don‘t have to engage in ethically problematic deals.