Securing is a process, and all systems in the world today have potential flaws and can be attacked at any time, which is why Microsoft Bug Hunter exists. We shouldn't worry too much about this.
I disagree, security is the most important thing these days, as we spend most of our time working and storing assets online. The best way is to stay away from centralized services, the less you depend on them, the more secure you become. I hardly use telegram, so I know about these news and I won't use them either.