Yikes this seems terrible for the drivers. There would be a race to the bottom surely with the most desperate drivers who perhaps just need to make a mortgage payment today undercutting everyone else.
If I look for Ubers and one is offering rides for 50p I'd take it, because the result should be the same as anyone else offering something more expensive and I have no relationship with my Uber driver.
If a gardener stats to offer gardening services for 50p an hour I wouldn't go with that, because I have a relationship with my existing gardener and I'm suspicious how quality someone can be for 50p an hour.
See the practical difference?
An individual driver may have a loan-shark threatening to break their fingers for a repayment that day.
I think individuals are going to be much more volatile and so create a worse race to the bottom.
Maybe let drivers set a price above a floor? Could be like their own surge pricing.