Corsair has a lot to answer for.
In 2014, the PC parts specialist debuted the world's first mechanical keyboard with Cherry MX RGB switches. The idea, according to Corsair, was to provide the ultimate in keyboard customisation by individually lighting each key with an LED capable of displaying one of 16.8 million colours. Coupled with some bundled software, users could light up the WASD keys in a different colour for use with shooters, turn the number key row into a real-time cool down timer, or turn the entire keyboard into a garish music visualiser. Unfortunately for Corsair, so bad was the bundled software that most people simply took to setting the keyboard up with the most eye-searing rainbow effect possible and called it a day.
Which brings us neatly onto the current state of the enthusiast PC. What started with a single keyboard has grown into a industry of RGB-capable components, peripherals, and cases designed for maximum levels of rainbow-coloured nonsense. Indeed, alongside the inclusion of tempered glass side panels, RBG lighting has been the de facto trend for 2017—so much so that it's harder to find components without the tech rather than with it.