qubic.org, a miner with very high computing power, has made no secret of wanting to ignore legitimate blocks from other pools.
Would a generally legitimate reaction of sincere miners be to ignore the blocks of this belligerent miner?
It already looks to me as if the operators of some mining pools are taking countermeasures behind the scenes.
The administrator of supportxmr.com has a lot of experience and is trustworthy and certainly knows how to take countermeasures.
Perhaps an emergency feed for mining pool operators could be introduced, in which only recommended countermeasures for pool operators are communicated.
An option to adopt an emergency block list, which is switched off by default, could be introduced. The recommendation for pool operators and node operators could be to activate this option when starting the Monero software. This list would have to be distributed by experienced pool operators or members of the Monero core team.
We already have a block list, which MRL has recommended to activate. This could be extended by IP addresses from qubic.org.
ELI5?
If you are a miner yourself, use P2pool.io. It has some advantages over the pools as they used to be known. The decentralization makes it hard to block. Every operator helps. Also, P2pool has no fees or high withdrawal limits. GUPAX makes P2pool very easy if you only want to mine with a single desktop computer.