Normal people signup to post not to hang around and scroll and like until the account is warmed
Using the 1/9/90 split [0] for creators/commenters/readers, it seems farfetched to suggest that reddit accounts (which benefits readers making an account to curate subreddit subscriptions) can't follow this pattern where many legitimate human users do not comment often.
[0] "The 1% Rule", https://en.wikipedia.org/wiki/1%25_rule