Its not a shortage of workers, it's a shortage of underpayable workers.
This is likely true. I just read a report that said that the shortage highly correlates with the reduction of immigrants due to COVID and the tightening of immigration into the US. It may not be the only factor, but it is one that contributes to the shortage of service workers. Like it or not, new immigrants are more likely to take jobs that pay less as compared to non-immigrants.
1. https://www.wsj.com/articles/illegal-immigration-arrests-hit...