Final answer:
The fictional cosmetics pyramid scheme started by Moira and David in the show is named Allez-Vous.
Step-by-step explanation:
The cosmetics pyramid scheme that characters Moira and David are involved with in the television show is called Allez-Vous. Allez-Vous is portrayed as a typical multi-level marketing company in the series, drawing comedic elements from the challenges and quirks associated with such ventures. It is important to note that this scheme is fictional and part of the storyline in the show, used to drive the narrative and character development.