I find it interesting what kind of discussion break loose in fediverse given that an instance closes its doors at 10k users.
Some people complaining that there is no space for them etc pp.
Fediverse, especially mastodon, grows at a pace of 100k Users per day
So assuming "sane workload" instances be with around 10k Users before things go crazy, we will need 10 of such instances each day. And they need to run stable for years.
So consider running an instance