To keep control on services (Odata/REST) one can add logging to the service. This can be done by populating an entity with the name of the service, resource, user (when there is autentication required) etc. Having this data can give information about if the service is relevant, who's using it, maybe polling etc. A generic microflow can be added to the Rest-Services and to OData-services WITH authentication. However, also tracking the usage of the Odata-service WIHOUT authentication is relevant.
Therefore the idea:
Allow the custom microflow of Odata-service without authentication.