A very naive take from someone who clearly lives in a place where people have real choices, economic freedom, freedom of movement, and a government that protects them. "Just shut it down, bro" risks destroying your livelihood and leaving your family financially stranded, and yourself incarcerated or sent to the war zone. And it's not like Yandex develops weapons of mass destruction, you probably assume it's a collaboration even if Yandex simply hosts the Defense Ministry's websites. No sane parent will put their family at risk for this kind of stuff. "I'm going against the government for abstract ethical reasons" is something very few people/countries can afford.

And you can't shut it down anyway. The government will just nationalize it and keep it running. As long as you're the one in charge, you can at least throw a few hidden obstacles in the way, like dragging out legal processes.