Integrity proofs are good for all kinds of approvals and attestations. And while there are ways in which they can be abused (e.g. inserting centralized attestation services into a network), I think there are many legitimate use cases as well. In the past I suggested that FEP-5624 implementations may use integrity proofs to reduce the number of HTTP requests: FEP-5624: Per-object reply control policies - #42 by silverpill.