Actually I like the very fact that it is paid. Supporting the developer, and some sort of accountability.

Also, after trying connect, liftoff, jerboa (all perfectly good apps), etc I find that sync is most smooth and customizable.

It may need to be in some way decetralized though, even if some kind of certification authority needs to be in some coherent trust chain.

It makes me think of inrupt solid, although it’s not quite the same.

Also I seem to remember some dutch (or used in there) online idenity management infrastructure which allows to make some authorithative claims without getting entire identity revealed. Sadly I can not find it now.

I am a bit surprised about the diversity of opinions. For me, well organized muscle movement, both cardio and weightlifting, is quite enjoyable simply physiologically. Plus other things like resting the mind, enjoying the scenere, etc.