My point is, it doesn't matter whether you or I consider it a "bad definition". To say that these things are not pyramid schemes "in any way" is unnecessarily pedantic and not useful considering the context (the implications of their terms of service).
I'm also aware that not all communications use exact definitions at all times! Your smugness is not called for.
If you just want to link some government pages in the google results for 'pyramid scheme', here's one following the precise definition: https://www.fbi.gov/scams-and-safety/common-scams-and-crimes...