by access to the pool do you mean ability to post? Yes.

So a larger account could delegate RCs to spammers or, they could sell them in a delegation pool to applications. When there is a viable revenue stream, why would they give them to spammers unless the spammers would pay, which in that case, they would just buy the Steem for their own RCs.

The application can provide from a pool on sign-in and give something like 30 SP worth of RCs so that account could interact. when they leave out the door, they lose their RCs. This means that a pool with RC's ascribed to application A, can't have those RC's used in application B. I think.