Perhaps because I used it on my mobile phone.
I got a camera recently and have been debating whether or not to get Adobe's photographer package. Currently I just use Lightroom mobile.
Now I'm thinking I'll probably go with this. It looks really good!
"M" is one of those fundamentally ambiguous type of abbreviations that really shouldn't ever be used. (Kind of like nn/nn/nn date formats.)
It is commonly used to mean both "thousand" (M was the Roman numeral for 1000) and "million" (10K, 10M, 10B).
Why not? 10M seems the obvious.
I think andrewstuart was asking what qualified as a "user": how many were active, how much they engaged, etc.
But anyway, I was wrong; I poked around on the site and they indicate they really do have millions of users. So: wow, nice work!
[1]: https://www.accountingcoach.com/blog/what-does-m-and-mm-stan...
Is this still the case?