Or we could be a little more subtle. Tweak the pleasure centers just a little when an advertisement comes up.

Monitoring thoughts is already a requirement for FDVR, so we just keep some of that information.

If corporations have FDVR, so do criminals. Want a real sex slaves instead? Read/write access means your can reprogram a few girls.

Addiction: with direct access it only takes a few minutes and the addict does not need to consent.

Maybe the corporations do want people that work like machines. Just a little reprogramming can result in much more efficient workers.