The mileage limits will be the thing that hit some people most and the excess mileage fee seems on the high side. It’s really not that hard to need more than 10k miles a year if you’re needing regular attendance at regional hospital this isn’t close to you. It would seem sensible to me for the scheme user to choose their mileage needs at the beginning of the lease and use those who need lower mileage to offset the costs of the higher mileage users.
I feel sorry for anyone who goes over the mileage allowance and legitimately has no means to pay the additional mileage fee (even if a withheld GCB covers 1000 miles)