http://kekchan42aql5xs7bhhngml4nik4lztprqg4ezoqexs2v7usjenwfyqd.onion/tek/index.html
If that isn't enough of a reason not to use them, they most likely have their own proprietary back doors engineered into all their products and can get in whenever they please.
For me, I use free/libre software as much as possible because the projects are dedicated to user freedom. https://www.gnu.org/philosophy/open-source-misses-the-point.html If this is of interest to you, here's a list of free/libre distros:...