> According to the logic in France, since criminals use Windows, the CEO of Microsoft could also be blamed.

That's a very bad take. The charges are because of Telegram repeatedly refusing or being too slow to take down illegal content (illegal in France, that is): child pornography, drugs ads, etc. Meta and X both remove illegal content when a notice from authorities is made, unlike Telegram which drags its feet.

If Telegram was encrypted e2e, Durov would not have been able to know of the existence of that illegal content, and could have plausible deniability. As it stands though, Telegram was notified of publicly available illegal content, and refused to remove it, which is a crime in France, where Durov is a citizen.