How to prevent the updating of specific user fields

[merefield (Robert)]

@IJK_Rick

How do I ensure that nobody can update these fields (for example website or location) using aforementioned methods?

Write a plugin to change the API (ie override the Controllers, Model or the associated library functions)

@IJK_Rick

However they could still be updated using rails console

This is very unlikely btw, only admins will get to the Rails console.