How quote stuffing works
Quote stuffing is pretty simple in theory since it's largely done using computers. The goal is to confuse systems and traders and slow real-time price quotes to create price discrepancies. It can be done in a couple of ways: either within a single exchange or as a way to create an opportunity for arbitrage trading between two exchanges.
With the straightforward version of quote stuffing, you simply have your system place an incredibly large buy or sell order, depending on your goal. A sell order may push equities down, allowing you to buy at a discount because others will follow your system. On the other hand, a buy order can cause equities to rise, allowing you to unload an equity for far more than it's worth.