If these codeless "devs" get hired by someone to make their website and the customer wants certain things to work, the non-coding "developer" will be at the whim of the capabilities of the WYSIWYG tool they use, not their own coding capabilities.
I suppose as long as the codeless "dev" is upfront with their clients that they don't know code and are upfront that they have a limited offering, it's ethical. As long as the client knows that certain customizations may or may not be available to them and it also reflects the cost of the "development".
Don't get me wrong, I think WYSIWYG apps are great in principle, but in practice I think it's pretty limited on where they should be applied.