Well, there was an Open Letter on change.org which was signed by over 1M people, its author was shortly arrested. Also, there were more than dozens open letters from various communites (IT included, 33K signatures).
The only impact those open letters had is that now there is a new law in Russia which prohibits (up to 3 years in prison) any public calls to stop Russian army from doing what its are doing. This new law can (and will, in individual cases) be interpreted as "signing the open letter == call to stop a XXX == law violation".
the open letter from IT guys was signed up in the first days of invasion by 30000 people from the field (by the time I signed it). Long before this thread.
Russians are doing protest, signing petitions, writing letters.
But saying anything against the war is criminalized, risks are really high.
And this letters most likely will be ignored, as they were ignored in the past.
People are trying to reach companies, that are more likely to hear them.
I do not know if you are talking about this in the news, but there are many such letters
why do you think that we are silent? we simply do not have a chance to be heard, and you draw conclusions that everything is because of our tacit consent — it's actually not
biggest "open letter" (petition) https://www.change.org/netvoyne - has more than 1 million signs (not only from Russia, but it has). Peskov (Putin press secretary) reacted: "It's bullshit and sign cheating with bots"
You even can't use word "war" in massmedia - you'll be instantly blocked in russian internet and fined for 5 mln rubles (about $50k for now). If you want be approved massmedia you must use "special military operation" phrase. They even want to block whole Wikipedia because of this
4th March was signed new law - you can go to jail for 15 years if you participate in meetings against war, if you call war with word "war", if you posting some information against russian army.
Any money sended to Ukraine (even if you have relatives and want to somehow help them) are considered as betrayal of Russia and you could go to jail for years.