No medical background, but a regular donor here. Plasma donations involve taking your blood out, separating the plasma, and returning everything else in a continuous process.

This other article about one of the victims indicated that the machine issued 5 high-pressure alerts about this return process, all of which were ignored.

It's not unusual to get an alert or two. Sometimes there's a kink in the tubing, or an improperly positioned needle. Sometimes I fall asleep and the pressure drops.

Properly trained staff should know by the nature and frequency of the alerts to terminate the process. In that particular incident, even the machine told them to terminate, but was ignored.

Edit: where I am, for-profit 'donations' isn't a thing. And I've never had anything but the highest standards of care. Other commenters are probably right that capitalism is a contributing factor to these incidents.

I think it's more about shoddy training and oversight of the staff.