I never claimed to have knowledge of how that works. I said my server is blocking them because of it. So I can say that.
Here's a screenshot shot of what what my server said about why they're not allowing threads and a link to what different servers are doing. Some say why, some don't.
Mary625 (mary625@mstdn.social)'s status on Sunday, 17-Dec-2023 18:04:03 JST
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Mary625 (mary625@mstdn.social)'s status on Sunday, 17-Dec-2023 18:04:03 JST Mary625