Maybe the pandemic has shown operators what really happens when you structure a business to allow for constant churn and attrition.

There's never going to be much loyalty for those sorts of hourly rates and once the cogs start turning slowly at Swansea and the testing centres, there's only ever going to be one outcome.
Call-centres are in a similar position attrition wise. If there's another one around the corner offering 10p per hour more, people are going to go there as added up, that 10p can make a huge difference to someones bank balance.
The only difference between that low wage economy and a bus driver is the fact they don't need to pass a test or have the right licence.
Oh and all the responsibility that comes with being a driver, the lack of toilet facilities, the ability to have a break when it's scheduled (or as close as), without the massive implications and knock on effects, all the H&S concerns and much much more.

Having been involved in a project regarding 0-90 day attrition, I would love to know what sort of period these drivers are quitting by and whether or not they're doing it within that infamous first year.