Sir Chenjin - you asked " I’m curious as to why you think some businesses should continue being paid for not delivering a service and others not?"
That's a good question, and difficult to answer. I think the nearest I can come to it is that the person being paid has not withdrawn their services. I used to teach piano to a child whose mother did quite a lot of cleaning, and although it didn't pay her entire living, it kept the family's head above the water - as does my teaching. Her daughter got a big part in a school play, and the school scheduled a couple of rehearsals, plus the performance, on evenings when she had her piano lesson. Now. I do charge for missed lessons, but only if I haven't had 24 hours' notice, as there is always the opportunity to fut in a lessons for someone else if they had to miss. This mother gave me about three weeks' notice, but still insisted on paying me. She said "it really upsets me when people say, oh I'm going on holiday next week so we won't be needing you (so we won't be paying you) - I can't drum up a new customer just for that one week".
So I suppose that kind of explains why I'm still paying my cleaner for 2 hours a week. She's willing to work - indeed, she fetches my husband's weekly prescription from the pharmacy and has done other small errands.