The problem is that the $100 usually isn’t funding something critical to your org. If you are getting some key feature in return for your money most organizations will be happy to pay, a lot more than $100 really. But giving someone $100 for a product whose stated price is $0 doesn’t make as much sense.
They aren't getting Django or Vue in return for their money. They get Django and Vue for free. If there's an additional feature that doesn't exist and they need someone to develop it, they are typically willing to pay for that feature.
