Jim, An "SCO", is just another term for "LOI" or "MOU".
They're meaningless actions, until and unless they become actual contracts.
Probably 90% or better don't. That's the beauty of them.
They could be real. They could be fake. And they might never be mentioned again because the companies don't have to notify the public that they are no longer ongoing.
So, you can see why noone pays any attention to them.
In fact, you can see what the investing public thinks of them from the effect it had on the sp.