The decision to ban plastics has been communicated for a few months. It's only in the last few days that the law went into effect, but businesses have had time to plan. One could argue if the 3 months notice was enough, but people shouldn't be caught by surprise.
Wet food is a challenge in delivery. There are wax lined paper cups that are more environmental friendly, although not entirely eco safe.
Most of the 'wax lined' paper cups you're talking about are plastic coated paper cups in reality, and the actual wax lined ones are very bad for one's health.
So you are saying businesses had a whole 3 months time to find a reasonably priced plastic alternative that has the same properties as plastic (insoluble in liquid, durability, flexibility, and lightweight nature) but are eco-friendly and bio-degradable, which is a problem researchers of the world have no solution to? :) . In my opinion it was also government's job to suggest those cheap alternatives, or even give subsidy on them at least for the time being.
There is a reason rest of the world hasn't done it so far, because when they take some decision, it's backed by proper research by experts including suggesting the alternatives.
Wet food is a challenge in delivery. There are wax lined paper cups that are more environmental friendly, although not entirely eco safe.