Earlier quoted context omitted.
To add some context, the removal of trash cans accelerated prior to the hosting of the Tokyo Olympics. The municipal government was concerned about trash possibly overflowing from the can, thereby ruining the appearance of the streets. Meanwhile, Japanese subway stations still have trash cans, which are only blocked when foreign dignitaries visit the country. It doesn't seem authorities are reacting to the subway att…
I would never do this as a visitor to another country - but if this happened where I lived I would advocate mass littering until it was repealed. Just drop the trash where the canvases to be. If you could get even a single percent population doing this in a large city it would snowball and it would be over in 30 days tops.
In a nearby municipality there is a particular spot that sees a lot of dog traffic yet has no can. Some civilly disobedient good samaritan keeps leaving an empty bucket and the city periodically gets around to removing it long after it fills up. Seems to work well enough despite being entirely illegal.