The digest are available to all Forems which meet the minimum posting rate to trigger them. Right now that's fixed to 3 posts per day, possibly because fewer posts result in less varied content for the digest (I'm merely guessing it's to avoid repetition, so maybe @ben can better explain the reason for that number).
Yes, these are technically available, but fairly tightly configured to DEV's values. I think these would have to be adjustable for the automatic digests to go out similarly to DEV.
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Yes, these are technically available, but fairly tightly configured to DEV's values. I think these would have to be adjustable for the automatic digests to go out similarly to DEV.