At places of work people only use them because they are free. Adding a payment system would be more cost and then the fed workers will go back to charging at home where it is cheaper.
Good point. You may be right.
The Feds aren't providing free EV charging for regular employees to charge their private EVs. I am guessing a few people figure out how to skirt the system if they are insiders at a transport depot. The local working stiff that parks in a vast parking lot or on a side street doesn't and wont have access to EV charging stations while at work..