The author would be accused of having no standing to criticize open source if they didn't use it. There is no viable move with the mindset you display here.
I replied to the same argument in a different comment. There is literally a thousand ways to do it.
Eg
- Post on twitter/facebook
- pay for a proprietary stack
- pay for an open source stack (donate)
- print stuff and hand them out in person (half joking, but you get the point i hope)
no, the author could have used open source and then moved off for principled reasons that people weren't paying their OSS contributors, made predictions about what would come to be, and then be pot shooting at the FOSS community from a distance. Or the author could aggressively pay every single OSS contributor they are using, with receipts... Etc, etc.
