Have you guys noticed these kinds of removal lately? Whats the reason behind them?

I have been using reddit for a while and I dont create promotional content (with links or anything) but still posts get deleted. We dont mention brand even yet these posts get deleted? I have a few theroies but I am not sure if any of these theories is exactly true.

1. I think Reddit removes posts from accounts that dont have activity in hobby based subreddits or subreddits like askreddit. But then alot other accounts (which are new) and have only been used for brand related posting are going good so far.
2. Reddit has a metric to check if post is written by AI. idk if this makes sense but this logic seem to be true for 80% of posts that were removed by reddit like this

drshan said:

Reddit's automod and spam filters have become incredibly aggressive recently. Even if you aren't posting links or dropping brand names, your posts might be getting flagged due to low subreddit-specific karma, account age, or even the IP and browser footprint you are using. A lot of subreddits silently remove posts from newer accounts to combat bots. Try building up some organic, non-promotional engagement and karma in those specific communities first to build account trust before making your main posts.

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When you say new accounts, at what age you call an account new? Because I lost 1 9 months old account because this reddit removal issue.