There is a market I’d unequivocally recommend this for - those who have some disposable income and are too busy to regularly go to the gym. I happen to be in that group at the moment, where I’m lucky to get 15 minutes to do a quick workout on the way to the shower most nights. I hate subscriptions and I put this purchase off for a couple months over that issue, but now I can say that it’s probably the best $40 I spend every month. 9 months and 115+ rides (even though most are in the 15-20 min range), I’m in remarkably better shape than I was previously.
On the other hand, if you have time in your day to go to the gym, walk/run outside, etc., the value proposition isn’t going to be nearly as compelling.