I don't think that it's necessarily their "fault" when that kinda shit happens, but I think that pleading total ignorance on the matter is at least slightly disingenuous. Sure it is ultimately the individual's responsibility to decide whether or not to make the purchase and buying something because the internet man said it was good is kinda dumb, but on the other hand the internet man has a dedicated audience of hundreds of thousands who greatly respect his opinions and who have an interest in weird niche things that he covers. If the internet man says that these are hidden gems then you can be assured that the flood gates are now open.
Once again, I don't think this is really their "fault", but they should at least recognize that they can have this effect.