Long story short: In my opinion, many posts within a few minutes dont necessarily have to be SPAM. What am I missing here?
My opinion about this (if that matters): making a few posts in a short amount of time isn't hard. But in most cases, all the user is doing is coming to the forum to post 5~20 times in a short amount of time and leaving. Basically looking around in megathreads or generic posts for opportunities to post more generic stuff, which doesn't add anything to the conversation, so he can pretend he is having a real discussion while he is not. This with a lot of rapid posts is what helps destroy this forum.
Most of the times, he is just saying stuff that already have been said or which simply are garbage/useless. These "bitcoin is the future?" type of threads where people come and post 2-4 lines of "for me among the rest of cryptocurrency bitcoin has the most bright future" or similar in the 6th page of the thread (real example I just found after 1 minute in the Bitcoin Discussion board, from a user using a Cryptotalk signature). All this post did was count a +1 in Yobit's campaign count bot and waste my bandwidth. No one is actually going to read that.
It's not only the time between each post (at least for me). People act like all that matters is that they are posting, answering a generic question and that there is a X interval between every post. But it obviously isn't as simple as that. "Ok, my last post was 20 minutes ago. Now I'm free to go to Bitcoin Dicussion/Altcoin Discussion to post another generic answer".
That's why it is always pretty obvious that he/she is only making many posts in a row because he gets paid for that. I'm not sure if that's the case for the above user (he seems to be way above the average spammer, but I don't speak deustch), but for most people, that's what happens. If people stopped putting the signature and the pay-per-post above their real posting habits, nothing of that would ever happen. But sometimes you don't have anything to say but still want the extra $, while also being too lazy to think.
Sorry for the rant.