xyzzy01
One way to easily identify Apple failures is to look at availability internationally.
Noticing that availability is low years after launch, it easy to identify Apple Fitness+ as a failure. E.g. Apple TV+ was something Apple believed in, and it had a full international launch. Apple Music also expanded worldwide really quickly.
BTW - I don't have Peloton, but what I guess is their main competitor. Integration with equipment is a good thing - following along on runs and bike rides with trainers on the screen and speakers, ,feeling the speed, incline, resistance etc adjust automatically to the workout is a great thing that Apple can't match yet.
Sure, they also have things like yoga and strength training where this doesn't apply - but the main draw is their integration. The rest is just to make the whole package better value.
One thing I'd wish for the future is someone - e.g. Apple - pushing standards in this area, so we could mix a match services with gear -- e.g. select the treadmill you want, and then just select the service you want: iFit, Apple, Peloton, etc.