They explained it themselves - there's no evidence of abuse/exploitation. They literally have no legal requirement to even tell you as much as they did. You should be commending them for filling you in at all.
> They literally have no legal requirement to even tell you as much as they did. Is ‘fulfilling legal requirements’ all you look for in a business relationship? A restaurant has no legal requirement to make this food tasty but it’s what I’m looking for when choosing where to go.
Somewhat tangential but I'm not even sure that's entirely true. It gets all sorts of tricky due to the subjectivity, but surely fit-for-purpose laws apply here? I'd be really surprised if a five star restaurant selling $500 tasteless gruel with chunks wouldn't manage to get into trouble if they refused refunds.