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Well, if Creators do not bother to interact with their fans, viewers or listeners, then they probably won't earn much over time.

Engagement is where the money is-- even on old content. The original post may be years after the posting date, but each comment should have its own 7-day payout window. If I left a comment on a 3-year-old post, that comment can generate income if it gets upvoted or liked.

Even if the payout window is closed, tips can be sent at any time wallet-to-wallet.