Something what npub1s6z7hmmx2vud66f3utxd70qem8cwtggx0jgc7gh8pqwz2k8cltuqrdwk4c (npub1s6z…wk4c) explained to me last June: remember that small zaps are too small to enforce individually on-chain.
The threshold depends on mempool weather, but I think it's dust limit + ~170 vbytes * fee.
So, at 1sat/vb a reasonable threshold is about 700 sats, at 10 it's 2300, etc.
