I heard that in USA Telegram is used mostly by conservatives, trans-haters and drug dealers. But in Russia where I was born and where I have been living until the war, Telegram was a single source of alternative news and the main tool for opposition to putin. I had a talk with an Iranian guy recently and he told me the same: in Iran Telegram is the only source of non-state-propaganda news.
I do not care that Durov is just a billionaire who makes money on the trend of privacy. But I remember how Telegram successfully fought against attempt of blocking in Russia in 2018 by providing regular updates and using different techniques to avoid blocking. An attack on Telegram for me is an attack on the latest opposition to putin, khamenei, lukashenko and others.
Problem of Proton Drive is not only in the missing linux client. There is no support of WebDAV that makes integration with many open source tools (like note taking apps or photo management tools) almost impossible. Nextcloud is much better for me. Without a WebDAV (or one of other popular APIs) it looks like an attempt to create “walled garden” with vendor-lock on Proton, imo.