These actually point of a failure mode of the original topic's visualization, at least as it pertains to public transit: https://upload.wikimedia.org/wikipedia/commons/thumb/4/40/Ma...

(I think a previous commenter called this out by referring to subways as "wormholes")

As for car directions, you should be able to create an isochron by drawing circles in the transformed map!

I prefer the typical isochron presentation over the warping. It's unfortunately hard to find free, public isochron maps, though. Some examples I've found:

https://www.targomo.com/developers/apis/isochrone/

https://direkt.bahn.guru/?origin=8503000

https://www.chronotrains.com/en