During the 70s and 80s there was an explosion of processor architectures, many of which found their way to smartphone chipsets. ARM, which traces its roots back to the 1981 BBC Micro, clearly won the game but it faced competition in the past. Intel (and AMD's) x86/x64 rule the desktop and server market, but they briefly existed on mobile too. There's a lot of stories to tell here. For example, Qualcomm's Adreno GPUs come from ATI's mobile Radeon efforts (it's an anagram). AMD decided against supplying phone chips so sold the division. Do you think AMD execs regret that decision? Rival...
Source: https://www.gsmarena.com/counterclockwise_the_popularity_of_chipset_brands-news-31548.php
