In my state, it's $10 for a non-driver state issued ID card. However, the offices you need to visit in person have limited days and hours that they are open, meaning some people can't afford to take the time off of work to do so.
If for some reason they don't already have supporting identifying documents like a social security card, it could take multiple steps and visits.
It's important to note that this isn't some new blanket forgiveness. These are people who have been paying on their loans for 10 years. People who should've already been eligible for loan forgiveness under existing policies and who have already paid more than they took out in many cases.