It has always saddened me to see how some people will abuse anything. Years ago, it was a RAV4EV owner who charged every day at a local mall, because it was free. People needing a charge were inconvenienced, some greatly so, but no one seemed to be able to do anything. The mall finally removed the chargers. I see the same thing happening again.
After a long crusade to get drivers to place a cell number on the dash, a few did. Most still don't. Free chargers are blocked by Leafs and Volts for 8 hours at a time, who in no way need to be there. Others who need just a short boost are unable to charge. There appears to be no answer.
The only thing I can think of is a database of careless car owners, built by disgruntled owners who pull up for a charge and sit for hours while several bays are blocked. I doubt that anyone would tackle this, although Tesla could: If offensive VINs were reported to Tesla Ownership Satisfaction team members, they could be logged and checked. Any MS owner who is abusing the system could be requested to be more courteous. Car data could be logged to prove the car was at a Supercharger longer than, let's say, 2 hours. Numerous complaints on any VIN would show flagrant carelessness. I suppose the car could be forced to stop charging after several notices had been sent.
I don't know, but civilization depends on laws with teeth. Something free will always attract the lazy, the careless, anti-social. It won't work unless there are STRONG guidelines.
I hope Tesla is working on something that will help polite people be polite.