IHAC whose Fabric Pool term licence has expired. Because of imminent DC moves and company divestitures they don't wish to renew it. Also, the current data footprint is expected to reduce by 80% within 12 months due to a company split. They've 240TB FP licences currently in full use across two clusters.
Assuming they're on (or upgrade to) a suitable version of ONTAP, could they Fabric Pool mirror in the Cloud Tiering Service to take advantage of PAYG-style pricing on a monthly basis rather than fixed term one year commitment?
The solution is far simpler than I expected - since CTS is effectively a wrapper around Fabric Pool the transition I've outlined can be achieved without even moving data; just a chat and onboarding to a different payment model via the CTS team.
No data movement, no mirroring, no changes to the on-premises configuration at all.