Open VSX (and perhaps VS Code Marketplace) might consider adding support for identity verification through Keyoxide[0]. This would allow interested parties to easily determine whether the user bung87 on Open VSX and the user bung87 on VS Code Marketplace are really the same person and not just someone claiming the same username. There is already support for linking Keyoxide to one's GitHub account and even Hacker News, among other service providers.
[0] https://docs.keyoxide.org/advanced/for-service-providers/