The two main lists that are implemented by default are a defederation list and huge huge listof blocked domains which includes wikileaks for instance, there are other lists (I don't know if the "trusted instance" list comes prepopulated) and almost all can be emptied or added to. But that means that an admin that sets up the software has to go through a whole rigmarole to get the instance to neutral before being able to do what they think is best. And hope they didn't miss anything.

In the case of the blocked domains it's particularly grating since it has like 4000 entries that you either have to delete one-by-one or have to do a manual db transaction to empty the list and that is by design. Plus all you get as a warning that such a list exists is one line during the setup that says Added 'No-QAnon' blocklist, see https://github.com/rimu/no-qanon but it's definitely not just QAnon links.