Responsibility is shared. It's not one or the other.
Many people don't know what they're doing. That's kind of expected. But a tool provider and seller should know what they're doing. Enabling people to behave in a negative way should be questioned. Maybe it's a consequence of enablement, or maybe it's bad design or marketing. Where criticism is certainly warranted.
Are you sure? I'm not very active in that ecosystem, but if that was prevalent in the past, surely there's still tutorials and stuff out there that people would follow and create such projects even today?
More than that, it seems to me that the official python docs for packaging [still] talks about setup.py. Why would people not use that?