I was wondering if it is possible that a server can subscribe to a collection from the clients so that only the server got everything and the users only have their local copy of the data. 

I would like to create a meteor (mobile) app where people can create some content and store it in a collection (only local on the device) that noone can see except the "owner" itself locally and the server who owns everything. If a local collection is created the server subscribes to that collection so the server can collect all the data from every user and show it e.g. on a website. So I have 3 Components. The mobile app that generates the content (clients), the server that collects everything, and a website that only read the db with the complete content.

so,
is it possible that a server can subscribe to every collection from every user?