You are saying something you clearly do not understand. If there is a ban on alternative accounts, neither moderators nor administrators need to do anything manually. There is special equipment that identifies similar accounts based on several parameters, and the issue is not necessarily just a change in IP. The forum adheres to the freedom of users, and that is why alternative accounts are allowed here; otherwise, allowing one account would be a headache for cheaters. As an example of such sites, in our time there will be casino sites that can see who and where from and how many times enter and register on their site. On other sites, you simply won't be able to re-register, even if you change your IP.

https://richads.com/blog/what-is/what-is-an-anti-fraud-system/