红 is silk 纟 plus the sound 工: dyed silk. Color words in Chinese often wear the silk radical (红绿 both do) — color was, first of all, something you dyed into cloth.
红 is China's master color: luck, joy, weddings, the New Year. 红包 (red envelopes) carry money at every festival — now flying digitally through WeChat by the billions. 网红 ('internet-red') is an influencer; 走红 is to become famous; 红火 describes booming business. To 'be red' in Chinese is to be thriving — no other color does as much cultural work.
Silk 纟 dyed the color of luck — RED.
WeChat users send tens of billions of digital 红包 each New Year — the ancient envelope, now with a tap animation.