Why? Who wrote the rule that websites need to be available 24/7?
Just because the server is powered 24/7 doesn't mean the website has too. I turn off my personal NAS when I go to bed. No point keeping it on while I am asleep.
In PDP days you were given a allotted time slot of usage.
There are no rules and you can do whatever you want.
But businesses are usually closed at certain times because it's not economical to keep them open. There are not enough customers looking to buy a pair of socks at 3AM to justify paying someone to sell socks. Or depending on where you live there are laws protecting workers so they get a bigger pay if they work at night etc. There could be other reasons.
If none of those things apply then it is pointless to apply the same restrictions as if they did apply. That would be like driving a car at the speed of a horse carriage.
One could argue on a business though. A UPS truck is only going to deliver when you're awake.
Sure, yes the back-office of passing the item through processing centres require 24/7 operation's for the delivery to reach from left side of the country to the right but if we were not conditioned to accept 24/7 as a thing, do you really need X in next day delivery when if XYZ CompShop was open and sold the same item for a reasonable/same price at a reasonable time for you?
24/7 provides convenience but convenience isn't always the greatest nor always the best. It's these businesses that make the price high for the local causing them to suffer per-se because we expect it all now.
There are quite a few businesses that don't feel the need to grow but instead focus on providing a consistent service and good employee benefits.
Keeping a website generally available 24/7 is usually pretty trivial of a cost compared to the costs for everything else in running a business so to me putting effort into limiting business hours seems unproductive. If you receive significant malicious traffic or attacks during off hours it may make sense but otherwise the cost of keeping the lights on for a server are usually marginal at most.
Just because the server is powered 24/7 doesn't mean the website has too. I turn off my personal NAS when I go to bed. No point keeping it on while I am asleep.
In PDP days you were given a allotted time slot of usage.