There are 500 million posts on Twitter every day. Do you read them all? There are 2.8 million subreddits. Have you browsed them all? The internet is big. You’re not going to be able to follow everything everywhere all at once.
I agree it’s a bit more difficult finding all the stuff you like in the fediverse without a central authority telling you where to go, but I’ve managed to fill my feed with active communities. I might be missing something, but so is everyone else. It’s humanly impossible to see it all.
Script kiddies