One aspect that I think is the most important one when talking about releasing press copies early to big YouTubers is in regards to transparency. We want you to be informed customers and we want you to make informed decisions, i.e. not purchasing a product that you don't think you'll like. We believe that our videos are not enough for that and that we're not a completely credible source since we are the developers, thus, you as consumers would greatly benefit to have someone external from our team who is a known and experienced game critique to take a look at the game and give you their thoughts.
That being said, it is quite difficult for us to determine which YouTuber is big enough or good enough to get access beforehand. It is also, as some of you've mentioned, not really fair that someone else is given forehand access just because of their channel's reach. Thus, we will not give out forehand access but instead send out press keys the instance the game is released so that player's can get going with playing just as well as reviewing.