I was sending some screenshots to show a bug to a project creator and I got a message from the scratch team about it. I doubt it was reported, so did it automatically flagged or something like that? Do lots of image links get flagged?

I believe that when numbers are censored to Xs, the ST gets a soft report about them. Because I was did this as a test and I got banned, even though I posted it in an area where no one else could have possibly seen it.

I believe it was automatically flagged. Some years ago, I sent a bit of the HTML script from the website's console into studio comments, and it told me that there was inappropriate content in it multiple times before I was sent an alert. As many long comments with gibberish (in this case, the random letters in the links) are auto-flagged as spam, I think your comment wasn't reported, as a SENTIENT human has to report it AND a SPECIALLY EMPLOYED st member has to review a reported comment twice before you're alerted, and both would probably realise it's a harmless link, whereas a poopy robot has to review a message if it gets auto flagged.