I would absolutely watch a clanker olympics if it was tightly regulated, involving fully autonomous bipedal robots that fit within a strict physical envelope putting on inhuman displays of athleticism. I'd be particularly interested in gladiatorial competitions since on top of super human athleticism blood sports have otherwise fallen out of favor due to the human cost.
Are you seriously telling me you wouldn't enjoy watching mechas going at it with greatswords? As a bonus (as suggested regarding cars by another commenter) mount explosive charges to weak points that must be defended.
When I watched Battle Bots and Gundam Wing as a kid - even though the robots were cool without the human side of the story it’s all pretty lame.
So maybe if people were actually piloting or tele-operating the mecha, but just watching semi-autonomous war machines destroy eachother? Meh