Very useful for generating and reading .ini files, but in an encrypted form.
If you use a database and save the configuration inside these .ini files then it would be a good practice to use it.
Also many other packages use CryptIni so you will end up installing it anyway even if your application doesn't need to store settings in an encrypted way.
More information:
CryptINI – Lazarus wiki (freepascal.org)
If you are looking for more examples, please read this other article titled “learning by example“, in it you will find many examples.