In such cases, you can easily implement simple device detection and display “this is desktop app only”…
So do many non-vibe coders, somehow. I dont understand why someone would make a website without mobile support in 2026, when phones are the primary device for a lot of people.
Secondly, it's a tosser simulation. It isn't a transit app for someone running to catch the train. Someone "vibe coded" it for novelty and they owe you, or anyone else, literally nothing.
As ucosty mentioned, "It's a lot of work for very little return". As some who made dozens of fun little web gadgets and toys that hit viral success, there is something remarkable about how entitled people get for something that literally benefitted me in absolutely no ways.