I mean, that’s one solution to WCAG 1.4.1, but not the only one. Per WebAIM’s recommendations[1] on the matter:
- Color is not used as the sole method of conveying content or distinguishing visual elements.
- Color alone is not used to distinguish links from surrounding text unless the contrast ratio between the link and the surrounding text is at least 3:1 and an additional distinction (e.g., it becomes underlined) is provided when the link is hovered over and receives focus.
Lots of options in there besides just slapping underlines on things. Could be bold where other text isn’t. Could just be a color that stands out enough against your text. Etc.