Japanese prisons have a low recidivism rate, there are almost no riots and prison violence and games like "drop the soap" are pretty much nonexistent.
A big part of the reason is that jailbirds put in 16 hour work days doing projects like this.
They earn a pittance, but it adds up to something to start out a new life with by the time they get out. Or something to make life a little more pleasant on the inside if they are serving life without parole.
Good to see them doing something useful, but it’s hard to imagine that there is not a braille-embossing machine out there to do this automatically.