The whole business model doesn't have to be based on exploiting staff. Wetherspoons have actually got a very good strategy to drive down cost and create volume sales, by buying up stock close to it's sell by date and moving it on quickly.
How much goodwill could Martin have created if he'd offered to support his staff? He can afford too. Goodwill that would have been repaid by the public when things get back to normal.
However, people like Martin, Ramsay, Stein, Ashley and that tw@t Branson don't think like that and can't help themselves