Acrostics in TV Program Guide on Japanese Newspapers

Acrostics embedded in TV program guides on newspapers have occasionally been making a buzz in Japan. Typically, the embedded text is a message about supporting a local baseball team, some social issue, or just an advertisement of a program. Two examples are:

 

The program guide reads horizontally, but the first characters of each line spell out a meaningful phrase.
According to JapanKnowledge (24 September 2014), the first such instance is said to have been the one for a baseball game of the Hokkaido Nippon-Ham Fighters aired by Hokkaido Broadcasting Co., Ltd. (HBC) in 2010.
(By the way, these acrostics are produced by broadcasting stations, not newspaper staff (buzzfeed, 2016/4/20).)

There are even double acrostics, in which messages are embedded in two vertical lines.

 
Googling with "ラテ欄の縦読み" (vertical reading of radio/television guide) returns many examples including:
(HBC, 2013/6/12)
(CBC, 2013/9/19)
(CBC, 2013/9/20)
(NHK, 2018/3/11)
(RCC, 2016/8/6)

The following are examples of double acrostics.
(HBC, 2016/10/13)
(RCC/HBC, 2016/10/23)
(HBC, 2017/9/20)

(NB. Some of the dates quoted in the above may be the date of the tweet or the article rather than the date of the program.)