I find it surprising that people tend to think that everything is out there on Youtube! But Hey! That's just life
If you've been involved with your Sifu and his family, then you may understand the 'so-called' secrecy surrounding how people are taught and why it isn't just recorded and promoted for other peoples pleasure! Some people want to be known, and others do not seek the limelight.
It is only with the new generations that this attitude can change. Some of us have always been and always will be very open indeed