As much as we'd like to believe, most entrepreneurship is not in the form of AI pins and apps and gadgets, it's people starting small businesses and handling some existing facet of commerce. If MKBHD started making videos titled "The worst mom and pop store I've ever reviewed" then there might be a more compelling debate about ethical behavior by reviewers. In this case, it is a heavily funded product experiment by wealthy venture capitalists, so people are a lot less sympathetic when they hear "give them a chance, v2 will be better".
Also, this is by no means a new phenomenon - here's a TechCrunch review of the iPhone from 2007 titled "We Predict the iPhone Will Bomb": https://techcrunch.com/2007/06/07/the-futurist-we-predict-th...