Not sure how much this is true, but I got this sent to me as an answer to why Pavel Durov was arrested:

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Someone hacked into Israeli intelligence and is now leaking it on telegram and he (Telegram CEO) wouldn't help them stop it, like taking people off the platform

https://www.haaretz.com/israel-news/security-aviation/2024-08-21/ty-article-magazine/.premium/israels-futile-war-against-massive-iranian-hack-of-secret-data/00000191-6bd7-d1ee-afb5-6bff8a510000