Why didn't Kana Hanazawa laugh?

The biggest reason should be the fear of being "hacked" because of the Arsenal North incident.

The smile of Arsenal North comes from a Japanese variety show. In this program, the famous seiyuu Kana Hanazawa showed a very emotional smile. Since then, various tricks have spread rapidly, greatly increasing the reputation of Arsenal's northern smile. This smile first appeared on a Japanese seiyuu website, and was later posted on Acfun Anonymous Lost Island. Therefore, Kana Hanazawa has become the three giants of "Yan Wen Zi".

Further reading: In 2009, I spent the ninth and tenth episodes singing OP Love Cycle. With the release of the ninth episode of Hua, this song set off a "lovely storm" in ACGN, and the sound of coriander attracted more otaku's attention. What attracts netizens' attention most is her smile.