We believe those who write the code should get credit for it, not startup bros and unethical developers taking advantage of the inventors of Flask, Jinja2, etc.
Open source is best when the people who write the code get money for its use: Guido van Rossum of Python, David Cramer of Sentry, Armin Ronacher of Jinja2/Flask, the list goes on.
Don't be a loser and steal their code to make money at their cost. They have kids to support.