Open Platform vs Closed Platform

Category
Description
“A closed platform, walled garden or closed ecosystem is a software system where the carrier or service provider has control over applications, content, and media, and restricts convenient access to non-approved applications or content. This is in contrast to an open platform, where consumers generally have unrestricted access to applications, content, and much more.”
Person
Resource Datasbase
Source
Gabriel Weinberg's Mental Models I Find Repeatedly Useful