Ah yes there is the short description at the top. At the moment it talks a lot about "it", good idea to make it more focused on "you". How about this?
Lemmy is a discussion platform that is truly free. You choose which communities to be a part of and which posts to see. You can use extensive blocking and filtering tools to sort and curate your feed. You are in control and not a corporation, so there is no tracking, advertising nor secret algorithms. And you can follow the development in the open, or get your own ideas included.