Because it is nothing more than a propagandist mouthpiece for a puppet Government of a fascistic bureaucracy that is owned and run by multi-international banks, drug cartels and criminal billionaires.
It’s not though? Unlike many (most) other media outlets, it’s publicly owned, rather than being in the hands of the plutocrats you refer to.
if you’d said The Mail, The Sun, Facebook, and the majority of online news sites, you’d have been spot on. The BBC, while obviously vulnerable to bullying by whichever government is currently in power, is the nearest thing we have to a completely independent news outlet with no agenda of it’s own.
Give up the BBC, and you’re surrendering the entire playing field to Murdoch, Branson etc.