That's why virtually every renderer stochastically discards indirect paths with low contribution. Looking at the source code, this one computes every subsequent bounce, even those hitting the perfectly blue sphere after hitting the perfectly green one.
arXiv was built over a good faith assumption, where a long paper meant at least the author had put some effort behind, and a every idea deserved attention. AI generated text breaks that assumption, and anybody uploading it is not acting in good faith.
And it's a unequal arms race, in which generating endless slop is way cheaper than storing it, because slop generators are subsidised (by operating at a loss) but arXiv has to pay the full price for their hosting.
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