Thanks for the response, that totally makes sense.
I found the feature for memmy here , which calls all hide requests on refresh, which is fine for the user but like you said problematic for Lemmy.
Anecdotally I have noticed lots of empty fetches on refresh since they added it, only fixed by changing the sort options.
Well
I guess OP said 10,000 / 3,000,000 = 1/300 = .33% so a bit lower but maybe 3 Million is approximate?
Google says 2.048 population so 1/204.8 which is 0.48%