This wouldnt happen, and before i explain why, even static IPs aint "static". If you ask your ISP for a static IP, this IP is only yours for the duration you rent it, and then it is returned to the pool. If you move 3 months later, then this IP is returned to the pool, and innocent people would be hit by the result of an ip "ban"
Regarding allocation of IPs per subnet;
It makes very little sense for a consumer ISP to provide a subnet, for each household. Where i come from, you only have 1 public IP, your internal network is behind NAT. If i were to be the only one on this subnet, they would allocate 4 IPs to me, now most consumer IPs provided are class C addresses, which means that if an ISP ran by this policy, each household would have a subnet of 4 addresses, resulting in 64 networks per class C range.
You can see why this is very problematic, imagine a city of 1000 people, they would need 4000 subnets alone, imagine the routing congestion on the network in order to operate this, it would be insane.
In order to mitigate routing congestion on the protocol, you want to make sure all subnets are as big as they need to be in order to hold the user addresses required, so if a single street in this city has maybe 200 households, you would allocate 1 subnet to this street, with enough useable addresses(so over 200) to reduce routing congestion, and then use NAT.
Anyway, long story short, IP banning/flagging is unlikely.