Garmin

Garmin collects extensive health, fitness, and location data, but most of it is opt-in and consent-based — you can use the device without uploading anything.

Garmin doesn't sell your personal data or share it with advertisers, but shares it with a wide ecosystem of cloud and analytics providers, and is vague about aggregate data sales to third parties.

Garmin makes general security commitments but is silent on breach notification timelines, independent security certifications, and AI/ML training use — and explicitly states it makes no automated decisions affecting you.