The big players all have deals and make back doors available to every single big footprint application. Encryption or no encryption. You'll find that a lot of the seed money for new digital and social media platforms or software pools come from the intelligence agencies and aspects of the deep state itself. The front company is just a brand.....Fair few venture captial funds have links with the deep state or ex-intelligence actors.
Why it's out there and given to us is because it is useful for them. I can't honestly think of much that is safe especially if you are a corporate entity trying to protect a new discovery or patents or ideation that state preferred players want access to.
If your company has been working on military applications or bio-technology or other such cutting edge environments that take years and a lot of cash to develop you are a target. The will be all over your shit and be sleeping in your house.