Which in many ways looks deeply unapealing. The last thing I want to do is sell support or services. I'd much rather spend my time writing software that is easy to use and well documented.
Then, I guess, the only choice is Github Sponsors. And it doesn't seem to be a bad one[1].
The things the author does to go from 7K/year to a 100k/year looks awfully a lot like selling support or services.
Unfortunately, it's not available worldwide.
That, or using a very restrictive copy left license.
GPL would protect more user freedoms and potentially avoid big SaaS providers making profit off of your product, but it won't help you earn money just like that.
True, but depending on what you created, it might open up the path to dual licensing.