1/ People seem increasingly concerned about the term "daily active users" (DAU).

It's used by other web2 social networks (in SEC filings!) and now other decentralized social networks; we use Meta's definition (below).

Is there likely a better definition? Yes! 

Have we come up with a better methodology? Not yet.

starting from a baseline of something meta defined and leaving it as is does not inspire much faith

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What would you propose as an alternative?

How come no one else working on a social network — centralized or decentralized — has tried to do this?

don’t have a simple answer for you readily available, it just strikes me that if you’re trying to create/curate the next-gen social experience that borrowing any definition from the old guard isn’t breaking any grounds or even getting off on the right foot, imo