Likely it would still be a nightmare to deal with, might cause some aggressive bacteria growth in some parts of the system or cake the sewage with hardened sugar. Both sound a lot worse to me than plastic clogging the sewage.
But having the city put some sort of cover or catch by all the storm drains seems like the easiest solution. I’ve legitimately seen people during events elsewhere purposefully throw trash in storm drains because they didn’t want to walk to a trash can.
