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I bought a £16 smartwatch just because it used USB-C
(shkspr.mobi)
This is a most excellent place for technology news and articles.
The FOSS app GadgetBridge, has a number of supported smartwatches.
Supported watches can sync your health, activity, GPS, heart, O2, sleep data to GadgetBridge locally on your phone, instead of sending it online to who knows where.
May need to use the watches app to set it up, but then all happens locally.