I guess, but I don't see how much they can really influence Telegram without any stake in the app itself. They only seem to have a deal for cloud-hosting with the TON Foundation, a non-critical part of the app, and even that appears to be non-exclusive. So if Tencent tries to force a bad decision onto Telegram, what's stopping them from severing ties and moving everything over to another provider?

Of course, we don't know what the situation will be like in the future, but at this present moment, I don't think Telegram's security has been breached by this. (Also I think you triple-posted this comment)