I had a similar thing happen to me a little over a year a go. The offer wasn't rescinded, but I received a text message the day before my start date informing

I had a similar thing happen to me a little over a year a go. The offer wasn't rescinded, but I received a text message the day before my start date informing me that my start date was delayed (due to Covid). It was very frustrating because I had not only resigned from my previous position after receiving a signed offer, I also turned down a competing offer. I immediately followed up with the competing offer, but that was no longer on the table (also due to Covid). So, I filed for unemployment. It took about 10 weeks to receive the weeks that I claimed (due to Covid). It also was not nearly as much I would have earned otherwise, but still appreciated. The good news is that I did find a new job in a short amount of time. I'm still with that employer. In the end everything worked out for me. But it made me see how wrong things can truly go even when you do everything right (waiting for a signed offer before resigning, providing two weeks notice, etc). It's common advice to tell someone to just find a new job if they aren't happy where they are. I mostly agree with that advice. However, there is a flip side to that coin and for some the risk is very real and can leave them in an untenable position if the worse happens. It was certainly a stressful and revealing experience for me.