Multi-pools are parasitic. They are an attack on a coin, plain and simple.
Your coin is defenseless from these attackers.
Could somebody elaborate on the risks that multipools bring? The price of the coin rises, it becomes more valuable to mine, all multipools start mining the coin, the markets are overflowed with coins? Is that it?
Multipools come along and massively increase the hashrate of a coin, start instamining blocks and then immediately dump them onto the exchanges. They keep doing this until the difficultly retargets at which point they switch to a different coin leaving the original coin with a ridiculously high difficulty and a lower price so there is absolutely no incentive to mine it anymore. The original miners are then left with a woefully low hashrate vs the current difficulty meaning that blocks take forever to find and transactions start taking far too long. And when the diff finally gets back to normal there's absolutely nothing to stop the multipools coming back and doing it all over again.
There's a reason why practically every coin nowadays has KGW as standard.
Even KGW doesnt protect you. KGW sounds great in theory but it needs to be tweaked quite a bit. Dano is currently working on a unique algorithm to increase our defense against the multi pools.