I posted a personal project on reddit around a year ago that got highly upvoted and someone made a similar post with a bunch of "strange" comments that must be evidence of me astroturfing. I have to admit they were strange accounts, some who haven't commented in over a year, but I wasn't using any alt accounts or anything sketchy. Sometimes people just don't comment unless it's something they really like or are knowledgeable about, or maybe something else, I am not sure and couldn't explain it when it happened to me.