IFTTT is target more at personal usage while the others are more professional or more complex uses. n8n is, as the starting page, open source and self-hosted unlike those two.
The non-commercial aspect seems to be mostly directed at people trying to compete with them, not comercial users.
> You may distribute the software or provide it to others only if you do so free of charge for non-commercial purposes.
> You may use or modify the software only for your own internal business purposes or for non-commercial or personal use.