E-celebs have kind of replaced reviewers in many ways, they just tend to have more reach due to the entertaining nature of alot of them. I wouldn't say make it or break it though, I honestly think they really only have the ability to bring attention to products and maybe influence their sales in a positive way then they are to somehow actually ruin a game's reputation unless its a collective of people shitting on it. Like you can definitely find countless examples of a group of E-celeb types making a game far more popular sometimes even retroactively to a game from a while ago (driver san Francisco has more people talking about it now than when it released just cause of Nick Robinson, or how nier got a second life from word of mouth and videos about it leading to automata becoming a thing thanks to the support), however I cannot think of any game that was really set to succeed that popular E-celebs actually destroyed, they can turn people away from stuff but I dont think to any major degree.
Like assholes definitely conform their opinions to some specific folk, but alot of times thats a short lived stint from someone not even in the same market as what their complaining about anyway, like how many people that reiterate dunkey's talking points about how shit jrpg's and turn based games are, were ever gonna buy Octopath or DQ11?