Some stuff:
1. Video creators can set it to not allow comments until they "bless" them.
2. if you saw your comment, and it went away, later on the video creator may have deleted it.
OR
C. "Youtube" might have deleted it due to certain words, phrases, if your comment is similar to other ones, or if you have a flag on your account (if you have had complaints from other comments you have made
or
X. Youtube had a brain fart* with your account ---> There is a way you can post in the community and they will look into it (I had that happen with one of my accounts) There is an appeal process.
22. It could be your browser.
Eleventy-nine. Check this out :
https://www.reddit.com/r/yo...ments_for_no_reason/AI - "If your comment got deleted on YouTube, it's likely because it violated YouTube's community guidelines, was flagged as spam, or was removed by the channel owner due to potentially inappropriate content; sometimes automated systems can also mistakenly delete comments that don't break any rules.
Possible reasons your comment might have been deleted:
Policy violation:
Your comment might have contained hate speech, harassment, threats, or other content considered against YouTube's guidelines.
Spam:
If your comment was deemed repetitive, promotional, or irrelevant to the video, it could be automatically removed as spam.
Channel moderation:
The channel owner might have manually deleted your comment if they considered it inappropriate for their video.
Automated filtering:
YouTube's automated systems might have flagged your comment as potentially problematic even if it didn't violate any explicit rules.
What to do:
Review YouTube's Community Guidelines: Check if your comment truly violated any rules.
Check for notifications: Sometimes YouTube will notify you if your comment was removed and why.
Contact the channel owner: If you believe your comment was wrongly removed, you can try reaching out to the channel owner to explain your situation.
Appeal to YouTube: If you think your comment was mistakenly deleted, you can submit feedback through the YouTube Help Center explaining why you believe it was wrongly removed. "
One other thing, if you work at a job, and there are a bunch of machines, sometimes "The Youtube" doesn't like comments coming from ONE IP (The one 'external IP" your company routes their traffic through) Sometimes it will allow you to post a comment, but then it goes away.
Comments sometimes go away if you post the same comment as a reply to other comments, or the same comment more than once.
You can try leaving a test comment using a different account...
Good luck!
I like turtles