Contract hours, minimum pay, tax implications for pensioners, availability. Sometimes things are more complicated than just writing a script. This is quicker and can be disbanded just as fast.
I urge you to not assume your position is the standard and to see beyond your nose.
There's a very obvious and very real additional factor at play here.
* https://services.parliament.uk/Bills/2019-21/coronavirus/doc...
But those complications can be set aside for the moment, and anyone caught abusing the normal regulations can be dealt with severely later.