Semantic understatement
The thought is cut off in the middle of a logical chain, as the conclusion is already obvious to the author and their target audience.
"We found a great EMD domain. While analyzing its history in the web archive, we discovered traces of spammy links. It became obvious that using such a domain would lead to downranking by search engines, so we immediately abandoned it."
"Found a great EMD domain, nice search volume, medium competition, ready to go. Checked the web archive history, and there was a network of gambling doorways hanging there all through 2021. Yeah, alright then. Moving on."
Speed of thought vs. Typing speed
For a machine, text is an instrument for step-by-step delivery of information. It always brings the logical chain to the end, putting a period on the conclusion.
A human writes text as a cast of their thinking. If the conclusion forms in the head faster than the fingers can type it, the author simply abandons the chain of reasoning. They do not explain why gambling doorways mean death for an SEO domain. This conclusion is so obvious to them that converting it into text seems like a waste of time.