These are extensions. No one is preventing OSS communities from developing their own remote dev, Python, and C++ extensions. The VSCode extension API allows it. There are actually some efforts being made to do it.
But ... they literally did that here? I don't think it's malicious in this case. In fact I think they're giving away genuinely useful tools here with no obvious downsides to their use.
But I do think it qualifies.
Bit like the example of Martin Luther King being a criminal.