I guess it's one downside of dematerialisation with digital tech - I can't think of a single thing that would make sense. Everyone's got their own virtual portal to all the new technologies that come out, there's not much to look at out in the world.
Maybe as more progress happens in physical 'world of atoms' type things we'll see a bit of this come back.
Maybe then many people would stop carrying their own portals, as you can briefly use the public ones for the one-off situation where you need it, but enjoy a portal-free mind the rest of the time. Also quite useful in case emergencies as it seems those portable-portals tend to run out of battery, or get lost or damaged...
The crowns are also ground off I think
https://maps.app.goo.gl/rxcGDAc8Dv924zkv8
(It's art: https://secretldn.com/telephone-box-installation-kingston/)