Those lines (103–106) might look empty.

This is an Abstract Factory pattern at work. The Init class is just an interface and this hook (MakeWalletInit) allows Bitcoin Core to inject different backends depending on how it was built:


GUI wallet
Headless daemon
Hardware wallet interface
Or… no wallet at all.


In builds without wallet support, it just returns a blank Init object which safely tells the system, there’s nothing to do here.
Architectural preparation for plugins/modularity. In other words: that code is a hook where something can be “plugged in” later.
So: it’s not about what it does now, but what it can allow later.
In large codebases, such hooks are essential for long-term maintainability.