Under Trump there was a slow down in immigration into the US. The pandemic also did not help with the flow of immigration as much as the media tries to paint the “caravans of evil” to take yer jerb.
So, IMO I belive that what we are seeing is a compounding of events where those lower wage workers who certain “groups” complain about are not there to fill those “unskilled” jobs. That's why there is a gap that cannot be explained.
So now these types of businesses are waking up to the fact that they cannot exploit that work force because it has dried up.
Edit: I do not believe that the average American will do the jobs that those who immigrate here for a better life will do. They deserve better and make up the foundation of the US economy. They should be treated with respect and have the $15 min just as much as anyone and benefits should be provided through the employer.