@jume Depends on how expensive the services your admin is using are, but masto.host supports ~2000 users for $90/mo

https://masto.host/pricing/

For someone running a server themselves via Linode or DigitalOcean, it can be wildly variable but there is, to me, no way you'd need to spend more than $200/mo for 1k people. So like... ask your users to give a dollar a month and you should be okay? In my experience, people with more money will give more and offset the people who are unable to contribute