These machines aren't attractive to the budget minded or experienced brewing hobbyists*. They're for people who highly value convenience or those who have spare cash and urge to make beer but either don't want to spend the time to learn the processes and make the mistakes or are nervous about doing so. I recall seeing a YT video by someone using a minibrew and it illustrated a chunk of the target market quite well -- completely clueless about brewing but enthusiastic about the idea of it and money to play with. They had a "brewshed" that looked like it had been professionally decorated and, IIRC, happily dropped £10-15 on liquid yeast to ferment a 5L batch.
The issue I have with most of these things isn't the concept (convenient small batch kitchen-top brewery) or up-front price (although rich for my blood), it's that they all come tied to subscriptions and/or proprietary consumables. If an open solution to sidestepping the app is created at some point then these units could become something interesting to play with if they hit the used market. That said it sounds like sales are so low you'd rarely see them.
*The exception being people who also have large and even more expensive brewery setups and use these kinds of things for experimental small batches.
