How can companies ensure that their advanced personalization techniques are not crossing the line into invasion of privacy for their customers, while still effectively enhancing their customer engagement and loyalty?

Companies can ensure that their advanced personalization techniques do not cross the line into invasion of privacy by being transparent about the data they collect and how it will be used. They should also provide customers with clear options to opt out of certain personalized features. Additionally, companies can prioritize data security and compliance with privacy regulations to build trust with their customers. By focusing on providing value and relevance to customers through personalized experiences, companies can enhance customer engagement and loyalty without compromising privacy.