Monero is not minable with ASICs due to it's "hashing" algorithm RandomX using random code execution rather than a traditional hash, but miners pooling together their equipment to standardize profit still poses a security risk to the network if there's a malicious pool admin.

Like the blockchain it's securing, P2Pool is a decentralized pool itself with no pool admin. It's 1.0 release a few days ago signals for the future of fair and secure mining on the Monero network.