Pokemon Go in Phuket

Whilst visiting Bangkok recently I understood the attention that the media has been going Pokemon Go!

image from the Bangkok Post
In Bangkok there were people playing this game everywhere.

Then seeing the sign for the Metro really made it clear "Be careful on the Train Platform". Does this mean that there have been accidents?

Then we went to Hua Hin and saw more people playing the same game!

Then there are articles in the newspapers - articles from the Bangkok Post. Since then I did download the App again but am still confused (but I am Level 5).

and late at night...