Would restaurants/workers use a verified app where restaurants can post emergency open shifts and experienced restaurant workers can pick them up?

Servers, bartenders, cooks, dishwashers, hosts, barbacks, etc.

Example:

A restaurant is short a line cook or bartender on a Friday night, posts the shift, and verified industry workers nearby can claim it.

Biggest concerns?

What would make you trust it?

What would make you NEVER use it?