It's almost like there is a severe logical flaw in the common USian approach of just banning singular things, and then hoping that "the market" will fill in a constructive solution.
Still, that's not solely "the market". The values of the person managing the company and the perceived values of their customers (societal values) have informed that decision.
If it's true that there really are no disposable bag regulations in Switzerland, then the much different outcome under the similar regulations also supports my point. If New Jersey thinks it has a problem where bags need to be reused more, then it would make sense to spell that out in law and nudge towards the overall desired solution (more reuse) rather than simply banning "disposable" (ie cheaply made) bags and hoping that people will automatically reuse more resource-costly ones.