IP address commonality is probably a major part of this, so using separate devices only helps if they are on different carriers and you never use wifi AND you d

IP address commonality is probably a major part of this, so using separate devices only helps if they are on different carriers and you never use wifi AND you don't allow location services or practically any other permissions. With a single device, it's fairly reliable to use a vpn or multiple vpn providers and only log in to each account when connected to a given vpn.