Dude you are actually defending US and its hypocracy here, unbelievable.
There's a lot of differences in the relationship between US + YPG/PKK and Turkey + SNA.
World is a rules based order run by the US, it was a really dumb decision to send mercenaries or not clamp down on violations or put in a transparent program like the UN is doing in north east to prevent this. Even just for media. Even worse letting them use the Turkish flag. The US plays Russia and China like this, why did Erdogan think he was smarter?
The restrictions of being on that list are again related to weapons also military/security assistance and training:
"Governments placed on this list are subject to restrictions, according to the State Department report, on certain security assistance and commercial licensing of military equipment"
The US added Turkey to a list of countries that are implicated in the use of child soldiers over the past year, placing a NATO ally for the first time in such a list, in a move that is likely to further complicate the already fraught ties between Ankara and Washington.
www.cnn.com
America have manuevred Turkey into going to Afghanistan. Turkey needs US financial support militarily and security assistance. Now the US can only offer that with a presidential waver. US will want something in return again. Whatever Biden promised Erdogan in that closed room meeting could be void by this.
A few years ago there was a lot of talk of the relationship between US and Turkey becoming transactional, as Turkey would play both east and west. Here is the transaction.
Add the CAATSA sanctions, Erdogan has a real hard time ahead of him.
Largely avoidable. The longer these factions have free reign for all their violations the worse it will be, how do you demobilize these guys when an agreement with Russia is reached? They have made Turkey look bad enough as it is.
The coming burden will be immense in DDR (Disarmament, Demobilization, and Reintegration).