if you use the same fake one, then that is your number, its just pseudonymous. It does not matter what the info is, if it is the same often, it'll build a pattern on you.
You're thinking of the direct effects when you should be thinking about the tertiary effects. Your assertion is "I don't go around advertising that this is my BTC address, they'll never know it's mine"
does make me wonder about throwaway accounts (on reddit, for example); I wonder how many people regularly create them, but use predictable patterns doing so...