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Chairman_Pooh 1 point ago +1 / -0

I know it is weird that (as far I know) you are not automatically logged-in on other .Win subs when logged-in on one of them. In a sense they are basically websites of their own while also being able to share accounts some how.

They're on different domains, so the cookies aren't shared. This makes sense, in general you wouldn't want one website to be able to access the cookies for another, so browsers don't allow that. On Reddit everything's under 'reddit.com'.