What makes you think so? Is it only because you dont like Musk or do you have some insight into all companies using Cursor you want to share with us? Even if you dont like Musk you should realise that others may not share your sentiments and/or may have similar feelings regarding SamA, DarioA or any of the other CEOs in this field.
Enterprise customers care about things like guardrails and data safety. xAI has always been anti guardrails, and who knows if you can trust them with your data.