Sololearn's domain

Question

Why is sololearn's site is accessible only with "www." at the beginning of domain?

Answer 1

I tried to access the website using Chrome without www and that worked. Try different browsers.

Answer 2

Search engines count www.sololearn.com and sololearn.com as two different websites. So most of the websites use any one of them. Either sololearn.com will be redirected to www.sololearn.com or the opposite.