How Does the Choice of a Mining Pool Affect a Miner’s Exposure to Selfish Mining?

If a miner joins a pool that is large enough to execute a selfish mining attack, they are inadvertently participating in the attack, whether they are aware of the strategy or not. Conversely, if a miner is part of a small, honest pool, they are more likely to have their blocks orphaned by a large selfish pool, thus losing revenue.

Therefore, joining a very large pool carries the risk of centralization, while joining a very small pool carries the risk of being a victim.