Libreddit does this, and it shows a pointer when you hover over the bar/header where the username and upvote count are, to indicate that you can collapse the comment by clicking.
this post was submitted on 18 Jun 2023
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Lemmy
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Everything about Lemmy; bugs, gripes, praises, and advocacy.
For discussion about the lemmy.ml instance, go to !meta@lemmy.ml.
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there doesn't seem to be anything here