I don't know who Iwasawa is.
Those 2 clubs from V1 are the only ones that are known to be strict. The rest especially Hisamitsu encourages their players to post freely.
I thought this was common knowledge though. Korean NT players all have extremely curated IGs that goes the same for Japanese players. Image is very important after all. And Japan's fan culture is extremely obsessive they have to be careful of what they post especially the people involved. That's also the reason they can't just let people know they're dating.
I wonder if KYK's vlogs are also "approved" by Korea.