There are studies of AIS disabling events, highest proportion of ships/time. IIRC, avg worst is Spain, ~15% obscure. Then US, ~8%, then TW ~5% then PRC slightly less. US gets pass since US fishing happens in North West Atlantic - US has big EEZ. Not much info on SKR/JP (other biggest DWF) except they tend to fish where PRC fishes and do all your slave labour that other DWF does, so hard to believe they don't do AIS shenanigans. IIRC worse (by type) absolute was JP for tuna longliner. There's other consideration that DWF has global players interacting, i.e. JP doesn't do destructive trawling, but they run big transhipment reefers (fridge boat) to support to fish longer.

MSM will focus almost exclusively PRC. It's spiked narrative. TLDR, go track "research" on PRC DWF since ~2020 when the champaign started. The estimate of PRC DWF by west aligned research... laundered by western news went from something like 3000 to 6000 (reasonable), to 10000 to 18000... in 5 years. Meanwhile PRC wild catch increased from 12m tons to 15m tons, i.e. PRC somehow built ~30000 new fishing ships in 5 years, 950% increase... only to fish 25% more. It's all stupid all the time.