I was pretty worried about Cursor's business until they launched their Composer 1 model, which is fine-tuned to work amazingly well in their IDE. It's significantly faster than using any other model, and it's clearly fine-tuned for the type of work people use Cursor for. They are also clearly charging a premium for it and making a healthy margin on it, but for how fast + good it's totally worth it.
Composer 1 + now eventually creating an AI native version of GitHub with Graphite, that's a serious business, with a much clearer picture to me how Cursor gets to serious profitability vs the AI labs.