The visualization of a link/hyperlink in the diagrams
[[GOOGLE http://www.google.com]]
does not involve any different font, color or underlining for the string 'GOOGLE'.
It may be difficult to visualize when, as here, we are not displaying the website, but rather the reference 'GOOGLE'
Would you rather agree to change the default to an HMTL-like format, with a blue font color and underlined?