Who gets the swap fee?

Excuse me, could you please clarify who exactly receives the swap fee in cryptocurrency transactions? Is it the exchange platform that facilitates the swap, the trader who initiates the swap, or some other party involved in the process? Additionally, are swap fees typically fixed or do they vary based on factors such as the size of the transaction, the type of cryptocurrency involved, or the current market conditions? Understanding the distribution of swap fees is crucial for traders and investors to make informed decisions about their cryptocurrency holdings and transactions.