Which places you, the reader, fully in control of the width of lines you prefer to see. Adjust your browser window width, or apply a user style sheet to tell your browser to format the text the way you want to see it formatted.
> Adjust your browser window width, or apply a user style sheet
very funny, both jokes
I knew this reply would come... How many people do you think use custom browser stylesheets? It's probably smaller than 0.1% of the internet population and everyone moved on to formatting text so everyone can enjoy good readability. Also not all devices have the luxury of supporting custom stylesheets.
Of course it's always up to the site owner, but most people want people to read what they share.