The corporation, of course, did this primarily to protect itself in the future, if it uses traditional numbering in the next consoles after PlayStation 5 – unless, of course, by that time cloud gaming still captures the entire game space.
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The Gematsu portal has prepared a small retrospective of registering previous brands:
PS – registered in 2000, released in 1994
PS2 – registered in 1999, released in 2000
PS3 – registered in 2005, released in 2006
PS4 – registered in 2006, released in 2013
PS5 – registered in 2006, will be released in 2020.