Comment by dmoy

> same basic principle

Well yes and no - synapses pass-through-banking wasn't covered by SIPC, and neither would wealthfronts comparable product. But keeping it just in a standard Wealthfront (or synapse even) sweep account with no underlying banking shenanigans happening, is different from SIPC's perspective.

Just keeping stocks (up to $500k) or sweep (up to $250k) at a SIPC broker is probably okay, even if it's a new fintech. Fooling around with their weird passthrough stuff, less so.