Because about 10 years ago, those Safari/IE weren’t 1. as smooth/simple as Chrome and 2. everyone on the internet bar the tech nerds were pushing for Chrome. Firefox was viewed in the same light as Linux in my circles.

It was a meme that the only use IE had was to download Chrome. It’s not that crazy when you realise the power of word-of-mouth and the meeting the general population’s needs for simplicity and google-search integration/features