Permissioning for value types is managed through platform space. Any value types in a space are automatically imported and made available for the associated ontology. Other consumers can import the value types into their project scopes, similar to how users can import transforms profiles or inputs to pipelines.
Users who have View (read) permissions to a space can assign value types to property types or shared property types in that space and associated ontology. An Editor or Owner of a space can create, edit, or delete value types in that space.