I was thinking about this yesterday, and if FAANG means “big tech companies with continued big growth”, M is more deserving of the title than, for instance, G. FAAN all have over 300% return over past 5 years, as does M. G however is at like 130%, roughly the same as the Nasdaq. Which to me roughly means they aren’t growing faster than the average tech company (NASDAQ being roughly an index of tech)
I also felt that the N was out of place as its market cap is about 1/3 the next smallest (FB at $0.77B vs. $0.22B). The rest (and MSFT) are all > $1B. NFLX has a lower cap than NVDA, ADBE, and PYPL (and TSLA and BABA).
(Work at M, may be biased :) )