As far as i remember theymos had made a bitcointalk related URLs hovered with green color same with the underlined thing on the link. All non bitcointalk-related URLs are just ordinary either they put colors in it or not.
That feature is made to differentiate links and same with your reasons to avoid getting malware, phishing links and even scams. Anything that is NON bitcointalk-related URLs are considered as risky and might steal device data and etc.
So its up to the user if he will proceed to access the URL or not since we can hovered it before clicking it.