It’s your device. If it’s a risk for the company, they can tell you not to bring it on company grounds.
You keep saying "risk", but when you say being able to load software outside a device's store is "a risk", you may as well be saying being able to buy things from thrift stores or homemade things is also "a risk" and shouldn't be allowed.
And you have yet to establish that it's ANY safer downloading software from Google's own store, when it's riddled with malware as it is.
We're allowed to take risks. If a bot net emerges, the government can take necessary actions to shut down that bot net. We're not "endangering the net" because we can install our own software. Some of us MAKE our own software, and you seem to be suggesting we MUST get it certified before we can even continue running the software WE program for our OWN use.
Get out of here with this. This is far too restrictive for your sense of "safety" to matter, like at all. I don't care if you're uncomfortable with it. It's not your business. It's ONLY your business IF and WHEN ACTUAL MALWARE is discovered. You get to complain about SPECIFIC software. You don't get to complain about the mere existence of "unapproved" software. Freedom isn't safe. Deal with it.