I can see an argument. The way I see it, the damage or potential damages are:
1- Creates a market for stolen goods that may tempt an otherwise straight-laced employee into stealing, possibly at the cost of their job. By supporting the black market, you are indirectly causing people to loose jobs that they need.
2- Creates an unfair disadvantage to those reviewers who actually play by the rules. They can't compete with people who show the toys early, and since there is money to be made being a Youtube reviewer, you're costing them views, which equal money.
But, here is where I agree that these damages are so minimal that I find it hard to care about them. No one is forcing workers to steal the toys. Their pay doesn't go DOWN because they don't steal them, they just don't get any extra, illegal money. Anyone that DOES steal and ends up getting fired knew the risks and made that decision on their own.
As for the Youtube thing, there are so many factors (some knowable, some unknowable) that go into whether someone "hits the bigtime" as a Youtuber and can make/sustain a career of it. I just can't work up any strong feelings on that one way or the other.