Think of it this way, the advertisers that can't deal with kittens with lightning out of their eyes in the pitch deck are also likely the ones that would have a bad experience advertising on reddit and interacting with the community. By being authentic in the pitch deck, they deter clients that should be deterred, and attract clients they want to attract. Being authentic is a better, more efficient strategy.

In the post Old Spice Man world, plenty of major brands have embraced silly internet dadaism in aspects of their marketing.

I think it's a subtle way to weed all those companies out, that don't get reddit. I mean, if you don't understand the reference, how can you understand Reddit and its users?

I quite like it for that reason