Literally all major platform websites--Youtube, Tiktok, Twitter, Facebook, Instagram, etc.--ban all posts which contain misgendering and deadnaming as part of their broader "hate speech" policies.
Agree or not, this is "censorship", and it is "widespread".
It is hard to show examples of censored content because it is, you know, censored. But you can try some posts for yourself on these platforms and see how it goes.
So, you don't consider multi-trillion dollar valued companies, whose annual revenues are greater than the GDP of the majority of countries in the world, and who have sole control over platforms used by over 1/3 the world's entire population, to be "authorities" capable of censorship.