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!
besides the illegal stuff
That’s a slippery slope. Illegal in which country?
Something you (or I) may find perfectly fine could be heavily pushed back against and illegal in another legal framework.
Look at how abortion / LGBTQ+ rights / gun ownership / personal drug use etc etc etc change country to country.