Good move IMO. Anything that helps ensure affiliates act in the proper manner can only benefit the industry. It also serves to point affiliates at codes of conduct that they might otherwise not be aware of. Like me 
EGBA = European Gaming and Betting Association
The “Code” appears to be largely geared up towards Operators, but there are salient points that all webmasters should probably be aware of. Me personally, I think I will add the wording suggested regards underage gambling at the very least.