Pay It Forward is a system self-investment contract. Funds sent to the contract are time-locked for a period of time ("frozen"), usually 30-60 days by default.
After a batch of funds "thaws", anyone may withdraw those funds from this contract to their own account, without restriction.
In Proof-of-Work chains, "anyone" typically means miners, because miners have first access to anyone-can-spend funds.
Therefore, the likely outcome of this contract is "pay to future miner", and serves as a useful sinkhole for funds, a way to incentize continued security of the system.
Another outcome, less likely but possible, is that miners are asleep at the wheel, and the general public races to claim the funds.
The contract and tests are currently under active development (WIP).
Do not use with Real Money.