Except it makes no sense because as a scammer your goal is to get as many people as possible in contact with you so that you can scam them. You can only score on the goals you attempt so cutting out any person, no matter the reason, is illogical.
Keep following through the logic... You manage to hook someone who absolutely knows you're a scammer, and they keep responding to you taking up precious time you could be spending with someone who is actually likely to give you money. So, what is the upside to getting a response from someone who is never ever going to give you anything?
You’re assuming that there’s no cost involved in moving a potential victim through the pipeline. I’m sure AI has changed the game, but the general idea was that beyond the initial blast of spam you would have someone actually responding to those who fell for it. Putting in signals that it was a scam filtered out individuals who would waste scammer time because they would eventually figure it out before falling victim. By selecting for people who literally can’t pick up on obvious signs of a scam, you save yourself a lot of time and energy.