How will lemmy instances survive if they get too big?

https://lemmy.world/post/1113268

How will lemmy instances survive if they get too big? - Lemmy.world

I know there’s donations and the owners can use their own money, but there’s a limit. I doubt a platform with hundreds of thousands of daily users can survive with only donations.

Why? A single Linux server has been able to support tens of thousands of simultaneous clients for many years now.
Bandwidth is not free.
Text is small.