This x thread may not be the best source of clarity on what is actually being default opted-into. Sorry. I looked into it and it seems that Starlink denies browsing history would be shared [0]. Seems I can't edit the title any more.

Do you share my personal information for AI training? We are committed to protecting your privacy. In some instances, we may share personal information with trusted third-party partners who, among other activities, help us develop AI-enabled tools that improve your customer experience, although you can always opt out. Rest assured that we take reasonable safeguards to protect and secure your information whenever it is used or shared.

Will these AI models see my Internet history? No, your internet history will never be shared with AI models, including individual browsing habits or geolocation tracking, and we comply with laws prohibiting unauthorized surveillance.

What personal information does Starlink collect from me? We only collect what’s needed to provide you great service—like your name, address, email, and payment details when you sign up or order. We also gather some technical information (like IP address or service performance data) to keep your connection fast and reliable.

[0] https://starlink.com/support/article/b82cf54a-8e57-917a-bd06...