I'm not giving Fascist Musk and Zuckernazi more power by creating an account to view whether my house is going to burn down from the growing wave of wildfires.
And then they, too, can be defederated by salty Mastodon admins. At least I saw a lot of instances talk of defederating BBC when I still was trying to enjoy Mastodon.
I forget the exact reasons but I believe it was due to a perceived bias. I don't read BBC so can't comment but they described it similarly to how a liberal would describe Fox News.
When I lived in the UK what I felt among friends is that the BBC had a perceived bias towards the Conservative Party, although this may simply be a bias towards the government regardless of who in power. It’s been the Tories for the past decade before Starmer.