Weather forecasts need data, supercomputers and world class scientists to create complex weather models. They are not affordable by the private sector.
There are around half a dozen premier league government funded weather services including UK, US, Germany + European collaborations. Private weather companies, of which Meteogroup who do the BBC are one, need weather model output to provide a service fit for a user.
The UK are rated comfortably in the top 3 met services globally. For the UK I would expect them to produce the most accurate model output. US and German data is likely to be lower resolution.
Perceived differences in forecast accuracy probably have more to do with the user interface, the way the data is processed to produce imagery, and the language used to descriibe future weather.
It is probably the case that the UK Met Office is concerned with precision in its output. Private weather companies may be more concerned to flex their output to meet customer expectations - accuracy may be lower priority than the graphics, presentation or price.
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