I was worried about this too! Lemmy isn't that large for a social media site - does this mean Lemmy will scale poorly if it gets larger? Is it disingenuous to pretend self-hosting is a good idea as a the fediverse grows? Doesn't seem feasible unless you've got a CS degree.
Hope the developers have some tricks up their sleeves. That reddthat post seems... troubling?
I'm out of my depth though, I'm not a programmer (unless you count some ugly scripting in R).