This is a bad story but I almost chuckled thinking about my wearables. The main point is about proprietary chargers for wearables and I completely agree. I always avoid proprietary chargers or ones which are not easily available elsewhere for a fair price. For example before buying the replacement to my Pebble, I bought cheap chargers for when I travel.
However back to the story, the Oura ring charger makes it all seem like a storm in a teacup, The Oura uses a USB C but has a completely proprietary charger which is also size dependent and there are 13 sizes!
Can’t even start to explain how expensive 2nd hand chargers are on eBay. but I have a filter looking for dead Oura rings which are size 13 on eBay just incase. Even the thought of a 3rd party one is someone dashed to the wind.
You can also buy a second one, brand new from Oura at roughly 50 pounds!