Scammers target newbies because it's very easy to convince them to fall into scams. Because mostly newbies are quite greedy, and they can't control their emotions when they see something where quick-rich or easy-money-making methods are involved. On the other hand, newbies aren't aware of scamming methods here; they don't know how to verify real or fake things.
Scammers don't DM Hero or Legendary because scammers know they are experienced in the forum culture. They know very well how scammers try to scam us. So it's a hard task for scammers and would be a waste of time. They try with newbies, and sometimes they succeed in scamming them as well.
Another main reason for targeting new members is that they are new to such scams. Due to their inexperience and lack of knowledge about the scam, newbies are more likely to fall for this scam. Fraudsters mostly target those who have just registered on the forum. For such people, crypto scams may be completely new and the scammers may lure them in and cheat them.
For people who have spent time on the forum, it may not be very difficult to identify a crypto scam. So they are outside the list of scammers. People who are new to crypto may consider such scammers as generous people and fall for their scams, later on after they get scammed, they realize their mistake. We should remember one basic thing, no one will come to you without interest and no one will want your good without interest.