It’s easy to look at pregnancy (for example) as something which affects only 2% of your users. But it’s really something that affects 40% of your users 5% of the time.

twitter.com

Dana Fried on Twitter: 'This Is an Easy Statistical Mistake for Tech Companies to Make - And One We Try to Avoid in Chrome: It's Easy to Look at Pregnancy (For Example) as Something Which Affects Only 2% of Your Users. But It's Really Something That Affects 40% of Your Users 5% of the Time.' / Twitter

Source

Accessibility is used by everyone, just not all at the same time.