Put it the other way: what would be the benefit of publicly disclosing their secret sauce? Perhaps to help fuel their recruiting pipeline, but I can't think of any other good reasons to do so.
They don't have a product out, their secret sauce might change, Google/MSR might be working on something similar and just need a few hints in the right direction to get there, they get to keep a big first-mover advantage in whatever area their tech enables them to move into, and there's no opportunity for possible early adopters like yourself to get in on the action yet.
I'm guessing their tech isn't so much "critically secret" as there just isn't a benefit to their business case for publicizing what they are doing
They don't have a product out, their secret sauce might change, Google/MSR might be working on something similar and just need a few hints in the right direction to get there, they get to keep a big first-mover advantage in whatever area their tech enables them to move into, and there's no opportunity for possible early adopters like yourself to get in on the action yet.
I'm guessing their tech isn't so much "critically secret" as there just isn't a benefit to their business case for publicizing what they are doing