One of the most crucial skills when you don't have a boss telling you what to do is figuring our where to spend your precious time.
If a weekend project means, say, 16 hours of work, you need to value your time at less than $6.50 for this to be worth one year at the cheap plan.
If a whole team is expected to respond to the emails this service sends with new updates on a daily basis and do that in addition to whatever activity planning, communication and and tracking tools they're already using, then using this service instead of making a one time effort to get their existing toolset to spit out daily emails is probably a false economy.
And if they're currently not systematically tracking project activity, and relying entirely on verbal communication or email they're - for good reasons or bad - probably not overly likely to pay for to SaaS-based coordination tools either.
In this case, the customer provides (and doesn't share) the content and community, so what's being sold is the weekend project software hack. And the target audience is already using separate project management and version control tools, and knows how to hack their APIs.