I’d hazard to guess that they got wind that other four are thinking of kicking out the USA and are trying to get ahead of it.

The Five Eyes are supposed to be a bulwark against Russia and, later, terrorists. Now that the USA is aligning with Russia, sharing intel with them doesn’t seem like such a good idea.

Because people already know the chant and it’s dead easy to follow along and learn.

It’s not the words themselves that are effective. It’s the number of people saying them together. Chanting and singing in unison has a very powerful effect on human psychology for both the chanters and people hearing it.

Walk into almost a church to witness this effect, watch soldiers doing drills, listen to cheers at a sporting event. People are stronger together, we feel that at a fundamental level. Hearing people making the same sounds communicates unanimous intent. That can be inspiring or intimidating, it doesn’t matter much what words they say.

And they’ll do so under the pretense of “will nobody think of the children” while prominent Brits have gotten away with raping kids practically in the open. They didn’t even need encryption, they had people willingly turning a blind eye.