VSCodium and Microsoft Visual Studio Marketplace: Extension Compatibility and Terms‑of‑Service Considerations

The goal is to assess whether extensions published to the Microsoft Visual Studio Marketplace can be used in VSCodium without violating the Marketplace’s Terms of Service or compromising editor stability. By default VSCodium points to the Open VSX Registry, but users may edit product.json to redirect the extension gallery to the Microsoft Marketplace, a change that is known to breach the service terms.

Constraints include the removal of proprietary telemetry in VSCodium, which some Microsoft‑licensed extensions expect, and the potential for instability when those extensions rely on account‑based features. Additionally, automatic updates and security patches may behave differently when the gallery source is altered. What are the functional differences, if any, between installing an extension from Open VSX versus the Microsoft Marketplace in VSCodium? Does using a manually redirected gallery affect extension updates or security? Are there any officially supported mechanisms to use Microsoft‑licensed extensions in VSCodium without breaching the Marketplace’s Terms of Service?