I see lots of people using WoS or LightingTipBot for zapping. So in most cases a custodial wallet. As I am doing it myself. But: why not using a cashu wallet which is also custodial but has the near perfect ecash privacy? I ask myself why isn't there a service like the tipbot out there that uses ecash? When I research I only find ways to become a mint myself for others... My assumption is that it is too much of a regulatory risk to become a cashu mint?