A bit off topic... Elsewhere on HN we see articles that the 6+ month wait lists for EVs have collapsed and dealers are stuck with slow moving EV stock.
So we can assume that consumers/subscribers are fickle. Even deposits do not guarantee future commitment.
The question is: are you prepared to invest 6 months of your time (F/T) and money in building and releasing a MVP? Even to watch it crash and burn? Real entrepreneurs DO!