It’s one of the main differentiators between instances. If you want no filters, you can make your own instance or see if you can find one with a “zero defederation” policy.

E.g. if you don’t want to see a bunch of political propaganda or CSAM, and are into programming, programming.dev comes “pre configured” for that. Likewise lemmy.world, blahaj, etc… comes with their own flavour and configuration.