A former US convict talks about how much he appreciated having a tablet in his cell.

It makes me terribly sad to see this praise for a tablet full of nonfree software. Surely he is running several nonfree apps designed to mistreat the user.

I won't deny the benefit he reports. A computer can be very useful, even while mistreating its user in ways most people don't recognize. However, the mistreatment is entirely avoidable. A tablet with free software could have done the same jobs.