If a restaurant can't hire enough people right now, it could be because it is a shltty place to work. Most restaurants are.
The place I work can't get enough help right now, and a big part of that is because the owner thinks service staff can work 12+ hours without a break multiple times a week and should just suck it up. There are four of us who can do and think it is worth the money, everyone else is quitting or already gone. Bussers are almost impossible to replace at the moment because they are being demanded to work doubles and sacrifice school related things constantly, and the new ones aren't being trained because "ain't nobody got time for that" so they get frustrated and leave. I don't know if it's generational, or an American thing, or what, but a lot of people are sick of the "i offer you a place to make money, I own your life" entitled business owner.