(13 Nov 2020, 3:51 pm)streetdeckfan wrote To me, it's not unethical at all. 
From an environmental point of view the more services they can run with their more efficient vehicles the better, and if it takes an incentive from the government to do that, then so be it.

The difference in environmental output between the normal allocation and evening allocation will be minimal, if at all.
I'd hazard a guess the daytime allocation already attracts some sort of BSOG

It's all about saving money and making money. Nothing more.