[clowen]

For some background on why not.

Nintendo didn't make any money from the PC sales, so it needs to have revenue from this launch.

And for Factorio itself, the effort of porting to the Switch, and then the effort of going through validation with Nintendo. Even if they didn't want to charge you again, the company would need to cover the cost of dev kits, extra engineers, and a whole extra channel for development/release.