Ubisoft are often looking for new ways to punish toxicity and the nature of Rainbow Six Extraction offered another opportunity to discipline the leavers.
Rainbow Six Extraction will have a few mechanics that remind of hardcore games like Escape from Tarkov or Hunt: Showdown - you will have your operators and when they die during a mission, they will be semi-disabled.
This means they are not gone permanently but you will need to pick another operator and go rescue them. If you fail the rescue, then the progress from the first captured operator gets deleted and they start back from square one.
In an interview with GameSpot , Ubisoft also noted that leaving a match will have similar repercussions. Should you rage quit, get a case of surprise munchies or just be an ass to your team for no reason by leaving early, your operator will be treated as if they were killed. When you come back on, you will see that all the progress from the mission was lost and you will need to mount a rescue for the operator.
However, Ubisoft thought of unfortunate events that can impede the players' ability to stay in a mission. If your electricity goes out or the ISP messes up and you lose the connection, you will be able to get back into the mission as if it didn't happen.
This leaves possibilities for leavers to dance around the penalty but the system is still bound to be a decent deterrent for would-be leavers.