There’s nothing “disgraceful” about it.
It’s normal practice, Motability isn’t special – they’re a fleet operator like any other, like car rental companies for example. To MG, Motability is the same as SIXT. And yes, private buyers get priority over SIXT etc.
Prior: SEAT Ateca Xcellence Lux 1.5 TSI DSG MY19, VW Golf GTE PHEV DSG MY23
Current: Hyundai Ioniq 6 Ultimate
Next: we'll see what's available in 2028.