They can not. Most of the bans are done on location basis
Eg : u log in from a place then completely another i think its quite obvious
No. Most bans are not done on that basis alone. People use VPNs that make their apparent geolocation jump all over the place and they are not banned. People travel while playing and don't get banned.
But how would they know that this device is mine, not someone else using it ?
They don't know who owns the device you play on. But since they have no rules about whose device you are allowed to use, they have no need to know who owns the device you play on.
Comments
Eg : u log in from a place then completely another i think its quite obvious
No. Most bans are not done on that basis alone. People use VPNs that make their apparent geolocation jump all over the place and they are not banned. People travel while playing and don't get banned.
They don't know who owns the device you play on. But since they have no rules about whose device you are allowed to use, they have no need to know who owns the device you play on.