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I've never seen one of these before, is this what you get by having a DMARC entry in your mailserver?

I think the DMARC consortium has documentation and resources for interpreting these reports. You might want to check with one of their mailing lists. In any case it is not something that affects normal Groups.io users and isn't likely anything that Groups.io can help you with.

As I understand it, a participating email service will send you either summary or detailed reports. How many reports you get should depend on how many participating email services received messages you sent (by way of Groups.io or otherwise).

Your messages that go through Groups.io will fail DMARC, but that's generally harmless because you've published a policy of "none". These are not "threats", just notifications of what authentication results the various receiving services obtained when evaluating your messages.

Your messages that go through Groups.io will pass SPF and DKIM (Groups.io's server is properly configured for that), which is good enough for most receiving email services to deliver your messages.

Shal