cloudns.net does it a bit more customer-friendly way:
they e-mailed me saying they deleted some domains not because some entries were broken or had problematic entries, but just because it was "underused", i.e. too few DNS resolve calls. So the tiny data packets in their nameserver caused them unnecessary consumption of electricity or whatever. Very compelling! This is how they do business these days.
They bombarded people with all sorts of useless info, but not about this policy of theirs. Makes you feel very much like the proverbial "valued customer".
Everything is going downhill in this century, that's a fact.
dude, Wozniak in 1984 talked about how even Apple Inc. did only have audio cassette tapes to copy more tapes to sell their Apple I and Apple // computer software on - before eventually they had enough money to buy a floppy disc drive. Their chief financial officer was kinda elated about his tape based home finance software predating Excel.
... but they were tough guys, nothing could hurt them. They were also smart, bringing innovations to the battlefield such as concentration camps. That idea was picked up decades later in continental Europe. Coincidentally, the Brits interned some of the same people in those camps.