Did you not assume that the one who answers, quoting the first post, entered the topic for the first time and decided to respond exclusively to the author? I already asked you earlier, do you think people can read all 50 pages of the topic to understand that the issue of discussion has long been resolved?
It depends.
Let's say we are in a technical thread, the OP has asked how to recover their funds. People replied to OP and asked them some questions like what wallet did you use, what's your addresses type, etc.
After some pages, the issue was resolved and the OP was able to recover the funds. Someone jumps into the conversation without reading the previous posts and asks OP what wallet they used. This is 100% spam.
No one is forced to post in the forum. If someone hasn't followed the discussion and doesn't have time to read the previous posts, they should refrain from posting.