Links are currently displayed in black/white font.
Explanation
Compared to normal text, a link is clickable.
A different color would make it stand out better from the rest of the text.
This is also how it is handled in many other messengers.
It’s not only about links being clickable for me. It’s more about having links alongside other text. Links are usually not intended to be read by humans. So it is nice to have an easy way to see where the link ends and where the actual text from the user starts.