Anything wrong with using direct ASCII fonts on webpages?

Take this text as an example:

𝚃𝚘𝚝𝚊𝚕𝙿𝚛𝚘𝚝𝚎𝚌𝚝𝚒𝚘𝚗

If you make an HTML file copy and paste the above text directly in your text editor from StackOverflow, it will show up on the webpage with that font. Why isn't this the standard way for using fonts in HTML and instead most people just use font color when they could simply use ASCII?