If I had 1 user on month 1, 1000 users on month 2, 5000 on month 3, 10000 on month 4, I could claim a 1000% (10x) MoM growth rate. But that'd imply you'll have 100K users during month 5 and 1M users on month 6, whereas it'll likely be <40K.

One of the reasons you look at MoM growth rate is to project how fast it'll keep growing over the immediate future. It's unclear to me right now

BTW don't get me wrong, I like the story and the hustle. Just not these numbers :)