Of course the blame is on the developers. If you don't want commercial enterprises to repackage your project and exclude you, choose a license that says that! How is this even controversial?
As seen on HN multiple times.
Which is what the parent refers to with the more politely put "either your fault for using a permissive license OR shame on you for not using a permissive license"
Don't want to pay me? Well get payed the same way.
There are plenty of business opportunities for commercial software, it is just hard and takes effort, like everything in life.
They were under no obligation to, but it set my career back five years and I'm still angry about missing out on the obvious route from graduating to being really awesome at what I wanted to be really awesome at.
It's not controversial that they did this, I was a junior employee and they didn't have a ton of money. It still significantly damaged my career to be forced to start all over on a totally new thing despite literally inventing what they were doing without me.
Blame? There doesn't have to be blame for that to suck for the little guy.