Seems somewhat low...probably more like 100%.
It happens in the US tech industry too. If you have a conservative political bent, you are blackballed.
Wait... a leftism infested domain where expressing a different opinion is deemed heresy? Imagine My Shock!
Orwellian, totalitarian leftism. It happens every single time. The left control the schools, the media, and the public services including the police services. Bernie's team are talking about gulags and forced re-education. History repeats itself unless we stop it.
And that's just the ones who are prepared to talk about it.
It's the UK version of Hollywood.