We're already dealing with information-density loss and the Fisher-Pricification of the GUI, and maybe this is the next step in overwrought 'we know what you want to do better than you'.
I have no ire for the creator of this. But respect boundaries, people. You are not your user's parents.
Only if you have some advanced accessibility features that lets me use the site without my arms, which are now completely limp.
This page which uses device time doesn't work well for me because I use UTC as my device time regardless of where I am in the world.
IP geolocation isn't a good idea either because I often access pages through a VPN in another timezone.
In short, nice thought but no thanks.
Also, great way to get your page downranked if a search engine comes prowling around your website at night.
I tried timezones and DST for a while and hated it, and decided to do away with it.
Take Hacker News, for example. This is not a site that maliciously steals attention for the gain of the owners. It still has the capacity to be a solid time sink. If the admins felt so inclined (and I'm very much not insisting they should), they could say "this could cause harm. Maybe we mitigate that harm by putting an extra barrier?"
And they actually do! Check out "noprocrast". Admittedly this is opt-in instead of opt-out, but websites (and even businesses in general) can sometimes take into account the wellbeing of customers over what measure of "efficiency" they may have.
It’s not quite the same as when Mommy tucks me into bed and turns the lights off, but I still find it helpful.