I just don't understand why people spam the TestNet with hashrate for no reason.
Probably the reason they do it is because it's profitable, and that's because testnet coins have an actual monetary value in this exchange:
https://altquick.com/exchange/market/BitcoinTestnet4.
We are going to work on a P2Pool tomorrow.
To earn dust with 1 TH/s, the pool is required to find a block. You need significant hashrate to solve a block with the current difficulty, so that you can split share afterwards.