even 3 resends or passive mixing makes the set effectively on order of millions. the main issue you had with resends was connection to network wasn’t private but you have many nodes for light wallets, vpn’s, and raw tx can be relayed in countless means to the network. they are aware of that issue hence all that work on i2p implementations for a while. saw this story posted by some zcash fans which is hilarious since zcash’s trusted setup renders the entire network centralized so its network and privacy is irrelevant.