That sounds like an interesting idea. I’ll share this with the team in our next backlog refinement meeting (usually Tuesday mornings eastern time US) and report back.
As a comparison, such security segregation may be implemented with alternative products - For example with JFrog Artifactory, it would require to create a specific repository (with expected permissions) for each Ansible Collection; but with following drawbacks: management overhead and lack of comfortable web interface to discover/review collections.