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In chat, the link color is extremely similar to the regular text color. I have good eyesight and a well-calibrated display, and I have significant trouble telling them apart.
Here's an exercise: somewhere in these messages are links. Can you tell how many there are and which words are the links?
The WCAG contrast ratio on these colors is 2.2, i.e. not very much.
Here's the source of those messages in chat so you can check your guess.