Ultimately, this is a placeholder solution so that more time can be spent on fingerprinting and identifying headless browsers (EG: via how they do font rendering) so that the challenge proof of work page doesn't need to be presented to users that are much more likely to be legitimate.
The design choices have performance implications. Here are benchmarks from the reference implementation of this possible alternative compared to Web streams (Node.js v24.x, Apple M1 Pro, averaged over 10 runs):
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（九）接到要求制止违反治安管理行为的报警后，不及时出警的；
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More than 800 men have played in an Ashes Test. England picked most of them in the summer of 1989. But the process of selecting the Guardian’s Ashes Top 100 required something more scientific than that infamous shemozzle.