"Occasionally" was bad word choice on my part. If "enough" (1 large or many small) miners are willing to fill 20 MB blocks of ~0 fee transactions, then some bitcoin users will send ~0 fee transactions, and some miners that mine for transaction fees will stop mining, which weakens the security of the bitcoin network.

While this has always been a vulnerability, it seems like increasing the block size limit makes this economic sabotage more potent.

There's no need for other miners to follow their example.


Increasing the block size limit reduces transaction fees. Eventually, miners are not mining for transaction fees, but mining as stakeholders to maintain the integrity of the blockchain. Only stakeholders mining doing PoW is like a really inefficient PoS.