When the quality degrades.
I mostly post in the Altcoin section where people talk about their favorite coins. How can you say my post is low-quality just because I am give my opinion in a sentence?
Interestingly it took you longer to post here, probably because you actually want to discuss something now.
No, I was waiting to read people's responses.
So you log in every few days and read the backlog of the threads you posted in within a minute? Its a discussion(!) board. You do not engage in discussions, you post in threads where you can get away with posting your opinion in a sentence or two without giving it any weight.
I open more than three windows on my browser, go to my favorite sections (which is altcoins) and chat with people.
What is wrong with that?

You are not labelled as a scammer - you are labelled as untrustworthy by Lauda. You don't need to interact with someone to not trust them.
What did I do to be labelled as "Untrustworthy"?
Do people become "Untrustworthy" for posting fast???

Lauda believes that its a way to clean up the forum.
I don't think it's right to give negative trusts to people who did not do anything wrong to anybody.