There's an assumption that there's some proof of work or proof of stake (or heck, proof of authority)-based sybil resistance mechanism that prevents anyone from

There's an assumption that there's some proof of work or proof of stake (or heck, proof of authority)-based sybil resistance mechanism that prevents anyone from launching a huge pile of nodes. I tend to (and think all Byzantine fault tolerance theorists should) view consensus set selection (where sybil resistance is a key goal) and consensus algorithms as largely separate problems.