One thing about internet sources is that in general, people engage with them if they choose to. Your piss-spraying analogy only works if the users don't have this freedom. At least for now, we the end users still have the choice to engage with LLM's, or to choose to navigate elsewhere.

So no, there is no randomly pissing around hoping that LLM training data is among the things being hit. It's Big G demanding everything as LLM training data and tossing it on the heap, and someone finding that said heap includes The Onion and individual shitposters, and with their dislike for LLM's, acting accordingly.

It's everybody's responsibility to get fucking literate in the use of media. Examples like these are harmless and just point out how easy it is for malicious actors, be it states, political partys, or other groups and individuals, to spread misinformation.
The use of AI tools such as LLMs makes this even more important.

Ok so now we make everyone be nice and do not post satire and miss information on the Internet so that the LLMs don't spread misinformation?

Yeah this will probably work very well.....

As if nobody is going exploit that.