Forum rules, spam filter, moderation and "old" threads

hi!

I'm new here, I've used and hosted some forum 25 years ago, it was probably easier at this time

Do we have some info about the spam filter? Most of my first messages were rejected by the filter, I had to remove entire chunks and change some words to pass through. Is there a list a forbidden strings so we don't have to guess?

Regarding moderation, can we see somewhere why some messages were not accepted for publication?
I gave some feedback for a tool on its dedicated thread, my message was pending approbation by a moderator and after a few days it seems gone (I guess it was rejected).
It was just some simple feedback after testing the tool, took me maybe one hour.
I read all forum rules again but don't see any I could have broken (except maybe the item "False information", but if that's the case it was not on purpose at all).
This is not a complaint, maybe there was a good reason and I missed it, I just want to know more for future posts.

Which brings me to "old threads". In my old times, it would be a sin to create "duplicate" threads, and people would point you to the 10 years old thread on page 42 about the same topic. But here I've seen the warning that a thread was "old" (~50 days which seemed very recent to me), and suggested that I create a new one.
However this was the only "dedicated" thread for this tool, by the author of the tool, it felt wrong to create a new one. By the way that's the thread were my message wasn't published by moderation, but I don't think that's the reason.
Anyway, it was a bit confusing, but maybe I'm too old

Last, I thank you all: authors of the game, mods authors, community managers, players… I read a lot of interesting stuff here already.