Hello Geoffs,
Sorry for the delayed response and inconvenience caused. As per the description above, you want to set up a Shared review by subscribing to Adobe Document Cloud services, Is that correct?
Adobe Document Cloud services include Acrobat and Adobe Sign services, along with web and mobile apps that work standalone or integrate into your existing document processes, productivity apps, and enterprise systems.
To know more about Adobe Document Cloud services, you may refer to Adobe Document Cloud FAQ
Yes, using the Adobe Acrobat Pro DC subscription, you can set up shared reviews for commenting.
To setup Shared review, you need to subscribe to Adobe Acrobat Pro DC license/subscription. The other participants can take part using the freeware Adobe Reader DC. For the initiator, Acrobat subscription/license is required.
For more detailed information about the Shared review, you can refer to Starting a PDF review, Adobe Acrobat and Participating in a PDF review, Adobe Acrobat
Feel free to update this discussion for any further assistance.
Regards,
Anand Sri.
[Edited Response]