As sport watches go, get a Garmin. Its proprietary, but it's the best in the class.
I have a Fenix 7, wife has a Fenix 5.
Battery last days/weeks (5/6 days with some 10-15 hours of sport tracking with GPS active).
I suggest some "older" models with MIPs displays, not AMOLED, because they have better (absolutely perfect) under the sun readability and much better battery life.
You need the Garmin Connect app on phone, but the web interface to the Garmin ecosystem is simply the best.
I managed to integrate Fittrackee (self hosted) and synched to my Garmin profile to keep all my activity self hosted.
Despite being proprietary, Garmin software is quite nice and the watch can be connected directly to PC to download activities and tracks even without using the app.
They get DMCA'd regularly and content get removed on Usenet as well. But the fact that they have to report literally thousands of individual files every time make it slow and inefficient. People will just reload the same item many times and it's always there.
Each copy, each single file in which the copy is split needs to be identified and asked for removal. Compared to torrents, it's a long and complex task.