There are two places to go for this for a reason. One of them is ten waves WHICH YOU CAN LEAVE AFTER and one is to 50 if you’re in it for the long haul.
Don’t join a fifty and leave after ten because that’s just pointless if you’re not even doing it on legend. Just load up the ten wave playlist if you’re gonna do that otherwise you’re just gonna piss off everyone you just played with because now it’s gonna take ten minutes for the game to find someone else or not find anyone at all.
Suggestion: A quitter’s penalty for normal difficulty 50 Wave Onslaught if you plan on ditching your team for something that there’s a playlist for. Leave early, get decreased rewards or locked out of the mode for 5-10 minutes. Easy work around for it is don’t inconvenience your match made teammates.
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I bounce because of losy teammates. I'll leave if I'm the only one grabbing batteries. I'll leave if I'm the only one doing objectives. So, no. No penalties for leaving.