I ask people on Twitch why their bedrooms are so purple and not red or green, and many think it's unique.
Blue was the "corporate" color back in 00s. Nobody would complain that something was blue. The sky and sea is blue. It's a neutral soft color that shows more personality and technical ability than black and white. Then every site became blue.
Purple is likely the sexy, edgy color. If you wanted to stand out, you get purple hair. But it's also soft and neutral as a background.