That was my thoughts too. No text editor is worth $3B, and probably not even VSCode is. So I think this deal was about buying more customers/users and buying "relevance". OpenAI lost it's monopoly and they're worried they might become irrelevant so they basically just purchased something popular to remain relevant.
> The other stuff could be more or less a VS Code plugin
The other stuff would take a team 6 months to implement. This is where the valuation comes from. Time to market, they are there TODAY.