One type of post that regularly gets flagged as Spam are those with photos. Photos weren't something that could be added before the forum redesign in 2019. There's many great photographers on the forum (I'm not one of them) who have some wonderful photos and even videos to share. The problem with flagging the posts with photos is no one understands why the objection since the anonymous flagger won't explain.
Is one on topic photo okay, but several is too much? Is it if it's off topic or not travel related? Certainly humor gets flagged.
Is it that scrolling through a thread with lots of photos takes a long time? No everyone has fast wifi or equipment with fast processors.
Maybe one solution would be to create a separate section of the forum with something called "Tour Albums" where lots of photos could be posted for those who do want to see them but anyone uninterested could just skip.