Man I hate this guy! He doesn't even care about casually spoiling anything and everything! Thank whoever created the Video Blocker Chrome Extension.
Link: https://chrome.google.com/webstore/detail/youtube-video-blocker/adbbfhgflidccdmkdggmllbbemmcgnah?hl=en

With this baby, you can finally, FINALLY kick him and all his spoilery cohorts off your recommendations bar for good! It's the only way to get rid of him because he has a fucking fanbase who call us the idiots for clicking on the video when ya know, IT'S RIGHT FUCKING THERE IN THE MIDDLE OF THE FUCKING SCREEN ALREADY LOADED UP AND SHOWING OFF EVERYTHING! GOD I MEAN GAMEXPLAIN HAS THE DECENCY TO USE A GENERIC SCREENSHOT THAT SAYS FINAL BOSS BUT THIS GUY HAS NO CLASS PERIOD!!

Okay, done ranting.

I'm glad I'm not the only person that gets extremely pissed off when Youtubers put the final boss or an important plot twist in the thumbnail. That's basically how I found out about the Ruined Kingdom boss and the final sequences on the moon for Super Mario Odyssey.