This disclosure is directed to privacy enforcement via localized personalization. An example device may comprise at least a user interface to present content. A message may be received into a trusted execution environment (TEE) situated within the device or remotely, the message including at least metadata and content. The TEE may determine relevance of the content to a user based on the metadata and user data. Based on the relevance, the TEE may cause the content to be presented to the user via the user interface. In one embodiment, the TEE may be able to personalize the content based on the user data prior to presentation. If the content includes an offer, the TEE may also be able to present counteroffers to the user based on user interaction with the content. The TEE may also be able to cause feedback data to be transmitted to at least the content provider.