One day, I feel this event will be seen as a canary in the coal mine.

Today most hashrate goes to Foundry or Antpool (or its vassal pools), backed by financial bindings to those pools in the form of loan covenants and other contract instruments. The common refrain of "The miner can just switch if there's a censorship attempt" no longer holds water, as who is the miner here? It isn't a cypherpunk with some rigs in their garage... Miners are business owners, with skin in the game and financial obligations, and they can't break contracts and stay in business.

Bitcoin has proven it is able to overcome real challenges when they become clear and present dangers - eg blocksize war - and so maybe it will require a direct threat and real censorship to lead to change in pool distribution.

When it does happen, we will look back and see the signs leading up to it.