For LN to work in IoT industry we need an efficient routing algorithm for one billion nodes forming a quasi-homogeneous network. Do you have one that doesn't require expensive bandwidth? How does LN incentivize to share routing metadata that could be used for detours? What is the most efficient leverage of available funds (too little will require to update routing metadata very often, too much is too expensive because locked coins don't "earn" profit)? How routing metadata are verified for non-neighbors and how dishonest nodes are punished? Can't a payment route be used to deanonimize payment recipients? What if a payment hub doesn't support payment network neutrality? What possibilities does a successful MITM attack give (it's an extra level, hence it's extra possibilities)?