Just a theory, but maybe the corruption is caused by forgetting yourself and your problems.
All the people we've met so far have left their past selves behind, fully embracing the book and its wonders, whereas Alice fully embraces the nature of humanity, and all its mistakes and ups and downs.
Before leaving room 000, she says "Once upon a time, there was an unforgetful princess..." perhaps referring to herself being able to stay true.
First time making a theory, probably bad, tell me what you think.