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In this scenario would you be relying on a proprietary extension to interact with GCP developed by Microsoft? Surely you would want to use a Google or Third-party developed extension to do that right? And in that case the developer of that extension would have a vested interest in making it available to you again, potentially in a forked version of VS Code. As long as the editor is open source extension developers can just fork it and create a new public directory of extensions. The only thing you potentially lose is Microsoft's proprietary extensions which are likely to always work well with Microsoft products and you really shouldn't use them to interact with Microsoft's competitors.