Reddit removes comments from new accounts because most rooms run filters that hold back accounts they do not know yet, and they rarely tell you. The fix is not a waiting period but standing in each room: answer a few threads there with no product and no link, and the same room will usually let you name your product once, then later link it where the rules allow.
A room's filters look at who is posting before what they say. Most subreddits run AutoModerator rules that hold back comments from accounts that are new, quiet, or new to that room, and Reddit's own spam filter adds a layer on top. The thresholds are private, so nobody outside the room can tell you the exact number.
That is why the same comment can stay up in one room and vanish in another. Your account has history in one and none in the other.
Reddit shows you your own comments even after they are removed. From your side the comment sits in the thread as normal. A logged-out reader sees nothing, or a removed placeholder, so the only way to know is to look the way a stranger does.
Two of your recent comments missing in the same room is a pattern worth acting on. One can be anything.
Think of each room in four steps. New here: answer with no product and no link. Regular, after a few replies that stayed up: you can name your product once when it answers the question. Trusted, with more replies standing and none missing: a link is usually fine where the room's rule allows links. Insider: posts of your own, where the room takes them.
These steps are our reading of how rooms behave, not Reddit's rules, and a room's own written rule always wins. A room that bans links bans them at every step.
Look at your comment history room by room: how many comments you have in the room you want to post in, and whether your last few are still visible to a logged-out reader. Then read that room's rules for anything about links, self-promotion or new accounts.
If a room shows warning signs, answer there without your product for a while, or spend your time in a room where your comments stay up. Kasspian's free account check does this reading for you and says what your account can post in each room today.
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Free Reddit account check: what your account can post, room by room
There is no single answer, because each room sets its own private limits. A better guide than time is standing in that room: once a few of your plain replies there have stayed up, naming your product once is usually fine, and links come later where the rule allows them.
Most removals come from a room's AutoModerator or Reddit's spam filter, and neither sends a message. New accounts, links and product names are the most common triggers. Check the thread in a private window to see what a stranger sees.
No outside check can promise a comment stays up. What helps is answering the question first, naming the product once at most, leaving links out until the room knows your account, and following the room's own rules.
Skip the guesswork. Kasspian finds the people already asking for what you sell, writes the replies, and shows which ones turned into revenue, with the sources behind every call.
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All rooms compared, rules read and removals counted, CSV under CC BY 4.0.
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