Any miners could construct candidate block with their own intended txs inside that block. Miners can't "ban" certain txs, but they can optionally not include txs into their candidate block. But most miners are incentive-driven, pay enough fee & your tx will be included in the next block (depends on the fee market atm)

many comments have pointed out that miners can choose to not include particular transactions. Miners can also attempt to re-org blocks that contain particular transactions. If you had enough hashrate, you could keep transactions out of the blockchain by excluding them and refusing to build on blocks that contain them.

That would take more than half the hashrate (I haven't dont the math on what number would be needed, would be a nice simulation to run). So it's not likely under the current incentive structures

Miners can decide to not include a certain transaction in their blocks, and if those miners have a significant portion of the hashrate, the transaction in question can be noticeably delayed.

Miners can even decide to treat certain transactions as invalid, rejecting any block that contains them. If those miners have a majority of the hashrate, they can effectively ban any such transactions from ever getting confirmed.

Presumably most of the current hashrate comes from miners that are not able or willing to operate below the radar of local authorities, thus they are prone to arbitrary legislation. So a geopolitically well-distributed hashrate is important for censorship resistance.

A miner can pick & choose whichever transactions they like. They just need to win a block.

miners could choose not to include a certain transaction in a block. is that banning?