Brexit and money. The ACO and FIA since 2017 didn't get a deal with Silverstone (or any other British circuit) that was financially beneficial to them, so they gave up and sort of used Brexit as a cover story/excuse to justify their decision (just like Audi Sport and Porsche Motorsport did with Dieselgate to justify aborting their WEC programs due to poor ROI outside of Le Mans).
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