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That's because it came to light that yt is soliciting a pedophile ring by making a wormhole which when you enter, you get nothing but soft-core pedophile videos and a bunch of sick bastards in the comments are timestamping when they are in compromising positions, exchanging contacts and links to child pornography.

The twist is that these companies that pulled funds had their ads shown on those videos, thus they had to do something to save their rep and dodge the outrage.