Firstly, how many IT workers fled the country is an interesting question with no definite answer. We have some figures from "ministry of IT" which Masha linked. She conveniently forgot to add that 80% of IT workers who left actually continued to work for Russia. Admittedly any number here will be a rough estimate at best. Still better than nothing. Another point is that though some experienced IT guys left the country juniors and interns are in insane competition for jobs. Another important point left out by Masha is that the incentive program contains a guarantee that qualified (finished uni with appropriate specialisation and works in IT company) IT guys are exempted from the draft.
Secondly, Yandex. It is presented as if it was that democratic and freedom-driven company and national success but then the war started and it was forced to censor the content blah blah blah. This is a blatant lie. Yandex censored search and news results before. We have good reasons to believe that Yandex cooperates with FSB regarding user content (emails and yandex drive). Moreover, IT companies in Russia are not limited to Yandex and VK. There is Sber. It is a government-controlled bank that now is more than a bank. Sber has its own ecosystem (streaming, location, delivery services, marketplace, AI department, AI assistants etc). You ain't seen nothing yet! There is a cluster of big b2b companies that work on the domestic market and CIS. Thousands of people work there but most russians don't even know that they exist.
Speaking of VK and social networks. Telegram is an interesting thing. It is not a Russian startup and government tried to ban it earlier. As far as I know in USA and Europe it is mostly used by people with more radical views. But in Russia everyone (I mean everyone who try to be modern, since VK is not cool) uses it now. Goverment, opposition, radically pro-Russia guys and ordinary people. It is more than a messenger now and something like social network. Telegram is a gray zone in terms of banned content. Btw I have a strong opinion that Durov reached an agreement with the russian government.
While tech giant in Russia are undeniably influenced/controlled by/depend on the state and hence censor their content and spy on customers, there are no compelling arguments that "Russia killed its tech industry". I'm sad that this kind of sentiment towards russian industries and people (as if all the brights have left the country) is the default in western media. It should be especially pleasant to think that russians are brutish, non-creative, and untrustworthy. I mean we are from jungle, and you are enlightened intellectuals living in your beautiful garden.
But content like this lacks intellectual honesty moreso depth. It worsenes the chances to understand each other. I wish I read on that page about the ways how russian IT industry is not actually dead (because it's the truth). How people living in autocracy manage to do cool tech things. I wish there was an analysis of russian government attempts to control the IT industry and media that would take into account worldwide trends in goverment and big tech relations (and no, that's not "whataboutism"). Instead there was another RUSSIA BAD.