Music lessons. There were multiple factors they shared, customer acquisition wasn't the only thing not working but that they brought it up at all is why it stood out. Indeed it is the kind of thing where referrals you would have thought would help, but also macro factors against. Competing against apps whether these guys are digital or not, anyone can start up a rival business at home esp if they have instruments already, and so forth.

I don't know the business well but to me as a buyer it's a bit like a hairstylist. Once you find a good one, or for me at least, I am reluctant to switch.