I see this as part of the left's war on bottled water, and largely not relevant to the stated issues as to why they are issuing a ban.
Did the EPA outlaw the manufacturing of “Canteens”?
There’s a difference between a ban and just not facilitating the activity. Not selling cheap bottles easily tossed as litter by those not smart enough to at least bring their own may not solve the problem, but it reduces facilitation of it.