So by my math and some googling, that's about 0.0000005% of Reddit's MAU.

On the one hand, cool, growth is growth.

On the other hand maybe it's... healthy to stop looking at Lemmy as an "alternative" to anything and start thinking about it as this small forum you like to use sometimes. Worked for me in the 90s, works for me now.

Reddit is calculating its MAU differently. They seem to be counting even not-logged-in users coming from search engines - without that numbers like “1 billion monthly active users” really don’t make any sense and even that is a crazy metric, if you think about it. There is no way that 1/8 of humanity is browsing on Reddit in a month. Lemmy seems to count only users who are doing something (submitting, commenting, upvoting)

If they’re doing that, it means they’re counting unique IPs, which is a ridiculous metric. Even lemmy would have easily 10x the MAU with it.

Again, doesn't matter. There's data on logged in users and it's also many orders of magnitude larger than Fedi.

By most independent metrics Reddit has more visits than Netflix. Than Pornhub, while we're at it. It's one of the top ten most visited sites on the Internet, and by most accounts it's actually grown since the "exodus".

I don't use it and I do like it here, but the idea that Lemmy is somehow encroaching on it is absurd. And self-defeating, too. Lemmy and its satellites are very worthwhile for what they are... a gnat in the wind as a Reddit alternative. Better to measure them on their own merits.