Double spending is a very important issue because

The halving events cause the hashrate to fall, thus increases the computation power and energy required to mine new blocks. However, the rising transaction fees help incentivize miners to maintain network security and sanity.11 Eki 2021

Usually, the fee increases during sudden blockchain rate fluctuations and major world events ; your crypto account has a history of microdeposits (like referral bonuses). If your account has large amounts of small deposits, the size of your transaction will be bigger as it will consist of many inputs.

Bitcoin transaction fees increase as transaction size and network volume rise . Miners receive transaction fees when a new block has been validated, supporting the profitability of mining. The Bitcoin halving increases the computational power and energy required to mine new blocks, lowering the subsidy of each block.

A transaction fee is paid when a certain amount of cryptocurrency is transferred from one wallet to another . Transaction fees are flexible in nature and can vary based on how busy the blockchain is. A user who wants to expedite a transaction can choose to do so by paying a higher transaction fee.