I think that coming from a country with a rich tradition of totalitarian brainwashing and political cleansing, we are more sensitive to hypocritical self-righteousness and virtue signalling.
According to messages on their Github, they theorize that Russian speaking individuals are less likely to fear for their careers, as a consequence of signing that letter, even if they otherwise support it.
> I think the dislike of cancel culture is stronger in Russia
Because “cancel culture” is a propaganda boogeyman invented by (or at least, used on behalf of) the political faction in the US that has been somewhere between useful idiots for and actively collaborating with Russian propagandists for the last half-decade.