The channel "Extremely Japanese" acts as a curator for western audiences.
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Historically, the largest player was DMM.com (now FANZA), but they locked most extreme content behind Japanese IP addresses. Western-facing platforms like R18.com (until its domain shift) and JapanHDV.com absorbed the "extreme" category. japan extreme com
Because digital regulation in Japan is strict regarding genitals, many extreme fans prefer un-pixelated Western releases. japan extreme com searches often lead to boutique retailers like DiabolikDVD or Unearthed Films (US/UK based) that specialize in licensing Japanese extreme cinema. The channel "Extremely Japanese" acts as a curator