Apple developers need to sign a NDA with the creation of an developer account. These videos are under NDA cause it is beta software and confidential. This is the reason why you need an account to watch those videos.
BUT even if they weren't under NDA this is totally ok! Going to the conference would have cost you minimum 1 week time and >1500$. You get all of this for free after only four days the conference happened. The only thing they ask for is an account and you are complaining about this? I will never understand such attitude!
BUT even if they weren't under NDA this is totally ok! Going to the conference would have cost you minimum 1 week time and >1500$. You get all of this for free after only four days the conference happened. The only thing they ask for is an account and you are complaining about this? I will never understand such attitude!