I agree with your basic point that just claiming the space with a flag and not using it is no fun but if you look at the final state of the section you posted the flags are very nicely decorated with artwork

Pull up … Pull up … Pull up

My bet is on VR/AR

- Tom Scott like channel exploring obscure urban locations, projects and other things. Very authentic guy with great music and language skills. Often makes his own background music by just piano covering a relevant song

KLOPF KLOPF