Explain the reasons for closing Miiverse, Wii U Chat, Nintendo TVii and WaraWara Plaza:
First, Miiverse is believed to be closed because it was not used much, according to my cousin, although this conclusion is crap, there are videos and publications on the Internet about this,
For the company however, it did not make sense that Miiverse will remain active, because users are using other social networks, this is the reason of the closure of Miiverse.
Many say that Wii U sales were too low to keep Miiverse active.
The idea of Nintendo at first was related to the creation of a social network of its own, where players could comment on the games and make new friends.
According to EMD troll called @samurp7, says that Miiverse closed so that Nintendo could be dedicated to the servers of Switch, this was the logical reason for closing Miiverse, I say this in the first post of the thread.
In the case of titles that used some functions of Miiverse, in some cases you can share levels as before, but without commenting on them (Super Mario Maker Wii U); you can not win extra levels or share levels (Mario vs. Donkey Kong: Tipping Stars from Wii U and Nintendo 3DS); there will be no posts, repetitions, sharing scenarios or creating tournaments (Super Smash Bros. of Wii U and Nintendo 3DS); the possibility of uploading videos to YouTube as well as the tournament odo (Mario Kart 8 of Wii U) was eliminated; you can collect stamps but not upload them (Super Mario 3D World from Wii U); the BLADE report (Xenoblade Chronicles X from Wii U) was deleted; and all postings (Splatoon Wii U) will be deleted.
Also, Nintendo said that for its Switch console there will be no service that replaces Miiverse, since the console has connectivity with social networks like Facebook.
Second, Wii U Chat, I do not know anything about the closure of Wii U Chat on the internet, it is believed that it closed because people used Discord and Skype to chat, more than obvious reason not to keep Wii U Chat active, because it was too useless when You have Discord and Skype for that.
Third, Nintendo TVii closed because on YouTube TV you can subscribe and it is not necessary, although it was free that YouTube TV, this service was closed in Japan on November 8, 2017, 2 years ago, while in North America it closed August 11, 2015, 4 years ago.
In case of Europe and Oceania it was canceled due to problems with multiple television services in those continents, in firmware version 5.4.0E, only in the PAL consoles, the icon of the Wii U Menu was removed, thus making the service already is not accessible, in the North American consoles, it happened in firmware version 5.5.0U.
Fourth, yes well WaraWara Plaza did not close, since it has no server to connect, it is a feature integrated by default in the console, it has offline mode and online mode (which, due to Nintendo's misfortune, is no longer valid today after the closure of Miiverse), making the Miiverse community no longer appear in WaraWara Plaza, because it was closed 2 years ago.
Even so, Miiverse needs to be revived to bring back WaraWara Plaza, but it will need the two communities of all the Wii U / 3DS games and its original interface that used the original Miiverse by default.
These are the reasons for closing the 4 services I mentioned?