In my opinion you're vastly overestimating how much of a moat Cursor has. In broad strokes, in builds an index of your repo for easier referencing and then adds some handy UI hooks so you can talk to the model, there really isn't that much more going on. Yes, the autocomplete is nice at times, but it's at best like pair programming with a new hire. Every big player in the AI space could replicate what they've done, it's only a matter of whether they consider it worth the investment or not given how fast the whole field is moving.