It depends

It depends, really. Some miners on the Ethereum chain, like Ethermine, use non-conventional ordering for their benefit, aka they generally don't do the by-gas sort.

Miners as intermediaries: extractable value and market

“The profit that miners can take from other investors by manipulating the choice and sequencing of transactions added to the blockchain.” As per BIS’s research

In fact

In fact, a new term has been coined for the profits that miners can make via their ability to choose which transactions to include and in which order: “miner extractable value” (MEV).1 This is

SoK: Preventing Transaction Reordering Manipulations in

MEV arises when miners or validators manipulate transaction ordering to extract additional value, often at the expense of other network participants. This not only affects user experience by

mining - What decides the order of transactions in a block?

Ethereum transaction reordering: Unfair and harmful?

MEV Overview: Hidden Value and Risks in Blockchain

User transactions on Ethereum

Here’s How Ethereum Miners Manipulate Transaction Orders For

User transactions on Ethereum’s peer-to-peer network are at risk of being attacked. The smart contracts building decentralized finance (DeFi) have introduced a new transaction ordering

Maximal Extractable Value Mitigation Approaches in Ethereum

Though miners are compensated for

Rise of Maximum Extractable Value (MEV): How Miners

Though miners are compensated for their contributions to the blockchain, they can order transactions specifically to boost their reward. As the university trio put it, with