Subscriptions are tied to your account. You can have multiple accounts in Jerboa (even on multiple different instances) but each one is independent of the others. Anything your subscribed to in one is contained entirely in that one. You only see the subscriptions of the account you're currently signed in to. All your accounts are listed on a popout and you can click on each one to switch which account you're currently signed into. All your actions and everything you view are relative to the current account.