Confused about this. How are you making money? Why do I need a central server? Is part of your unique (presumably commercial) offering that we can't run servers

Confused about this. How are you making money? Why do I need a central server? Is part of your unique (presumably commercial) offering that we can't run servers ourselves? It appears quite closed with regards to tech details (e.g. how you are fetching things for people). I am probably not going to sign up with this limited information, sorry.