I don't mind if that's how they incentivize people to help secure their network *if it works.* 
I'm just pointing out that it doesn't seem to have actually succeeded in doing that.

And as far as anybody can tell, it's only them running nodes, so it's basically a single centralized third party.

That said, I have used Session and it's improved a lot. The UX used to be terrible, but now it's pretty nice.
It just seems like their security model didn't work out the way they hoped it would.