alt Hacker News> Microsoft invented a pseudo-walled garden that has become a technical dead end
If you're referring to Windows, this is not very walled at all. You barely need a computer to write and release windows apps, let alone money.
Office, perhaps? Or a variety of other products.
Windows is an open platform for developers... if you ignore all of the security checks and Windows Defender and the stagnant platform which is about 2 decades behind everyone else, across the board, in terms of native tooling (e.g. which UI framework should I use and is it good?).
However, Windows also has many, many, walled garden things bolted onto it. You aren't distributing your own drivers without Microsoft's approval. You aren't running Microsoft Office on Wine. You aren't connecting to Active Directory without Microsoft's blessing. You aren't making group policies that work on Linux for MDM. You aren't manufacturing Windows devices, at all, unless they meet Microsoft's system requirements and mandates (e.g. a Windows icon on the keyboard). Your BIOS must follow strict rules about where the activation key is fused. Etc.
In that respect, Windows is only open from an end user perspective. In all other respects, it is closed, and it is closed tightly.