A social network distrusts an IP that changes and an IP used by many people. A fixed, dedicated address is the one that draws the least attention, because it behaves like an ordinary connection.
The limit
One address per account, always the same one, with the option to keep the same ones on renewal. Changing address in the middle of an established account is exactly the signal these networks look for.
None of this breaks a block or creates a fake account. The use is running your own accounts with a stable connection per region.