For small transactions, it's often a tolerable risk. You amortize any losses to double-spends and compare that to e.g CC fees. For larger amounts, you want co

For small transactions, it's often a tolerable risk. You amortize any losses to double-spends and compare that to e.g CC fees. For larger amounts, you want confirmations, but then it's generally alright to wait a little while for confirmation, too. Note that replace-by-fee means this only works with Bitcoin Cash.