3/4 of the entire tournament was literally who got luckier. Between big scam mage,scam rogue and predator Druid it’s a game of extremely low skill level and high amounts of RNG. This is why damn near every other game has higher viewer ships for their tournaments. The other bonus for them is they don’t even have to give stuff away for people to watch haha.
In order to have spectacular, Hearthstone sacrificed some skill in favor of casino decks. But still, those players you see in GM earned their way there. Through thousands and thousands of "lottery" matchups in hundreds of tournaments, these handful of players have shown the most consistency.
Obviously, they are so close in skill that in big tournaments like GM can be often decided by who rolls better random outcomes. However, that's not to say that a good lineup doesn't matter, or that some decks need lots and lots of practice. The players know it, and as a watcher you should just relax and stop worrying and feeling for the unlucky player.
As a competitor, if you really aim for MT, you need to take the game less seriously. Commit a lot of time to play as many tournaments as possible, and hope for the best. With enough practice and prep you should get there. But if you get emotional and tilt, maybe competitive is not for you, and there is absolutely nothing wrong with playing the game casually.