Epic Games is asking for your Social Security Number (SSN) for a few different reasons. The most common reason is to verify your identity so that they can process your payment correctly. This is especially important if you're using a credit or debit card to purchase something from the Epic Games store.
Another reason why Epic Games may ask for your SSN is to comply with tax laws. In some cases, companies are required to withhold taxes on certain transactions and they will need your SSN in order to do so.
Finally, Epic Games may also use your SSN as a way to track down any unpaid debts that you may owe them. This could include things like outstanding balances on game purchases or fees for using their services.
Overall, there are a few different reasons why Epic Games may ask for your SSN but the most common one is to simply verify your identity and process payments correctly.