More and more, I have begun to hear founders share an opinion of mine - MAU is not a very helpful metric anymore. For many (if not most) products, having users that are only active once a month isn't ideal, so measuring and optimizing for weekly and daily use wins out.
I'd love to hear your thoughts! I'm sure many of you are doing great using MAU as your ride-or-die metric, while others have labeled MAU a vanity metric.
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