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I'm not sure they're too interested in funnels, beyond letting people have a little fun (and some advertising that something like the Bell Labs of old might still exist).I picked the word funnel because I'm on HN and that's the quickest way to convey that showing me a signup screen before I've done anything of value is going to lose me. Unless I clicked a button to sign up or went to do something that I have an intuition would result in a signup page, I usually click control-w before I'm conscious of why.
Most users don't care about leaderboards and global leaderboards have been shown to have a demotivating effect. There's a reason why most games that show leaderboards now default to a friends leaderboard, with the global one tucked away behind it.
Forcing a signup to enable something I don't care about doesn't seem like a great bargain to me. Prompt me to sign up in order to save my progress and I might do it. Prompt me as soon as I interact with the page and I'm out.