Yes I use docker, I have documented my effort here https://wiki.gardiol.org/doku.php?id=services%3Alemmy

It was pretty easy and require zero maintenance, just remember to update the containers. Space utiliztion and resources are pretty low, depending on how many communities you subscribe.

Also, I host it at home (with public reachable ip of course)

I highly suspect that they’re the sole user on their instance. That’s fairly common for people who just want to avoid the headache of dealing with rogue admins. Just spin up an instance, and then your server only federates with the instances and communities that you directly interact with. No need to worry about the “things you would want removed ASAP” unless you’re the one seeking out those things.

I am my only user, so...