That’s why I asked for “what exactly” from my perspective and use I see more trouble deal with the flaws a mobile may have (I have no experience with grapheneOS or similar) say a stable wireless connection or a SIM, make sure the node goes out by TOR, if it’s mobile it may be out of connection for a while (or in a plane) and then it will need to synchronize or worse database corruption and start all over again, battery problems…