Kagi has an option to search the Fediverse. This makes it a lot easier than specifying a site in the search query, which would also limit the results to a specific instance.
Why YSK: This lets you easily replace searches like “some topic reddit” with Lemmy!
I like lemm.ee is as close as you can get. AFAIK it’s federated with pretty much everyone and it’s got a very large userbase so nearly every conmunity is federated.
Wait, a large userbase is required for an instance to federate with every community? I thought you could host a single user instance but still be federated with everything that you don’t explicitly block.
A community is only federated if someone on your instance subscribes to it.
Remote communities don’t federate until a user subscribed to them. There is this tool to automate it however.