WhatsApp has embraced the concept of third-party messaging services since the fall of 2025, aligning with the European Union’s Digital Markets Act (DMA). This legislation mandates that major technology players, often referred to as “gatekeepers,” such as Apple, Google, and Meta, must facilitate interoperability with alternative chat platforms. While the DMA’s intentions to foster fair competition and enhance consumer choice are commendable, Threema has opted against implementing interoperability with WhatsApp for several compelling reasons.
Privacy and Security Concerns
At the heart of Threema’s decision lies a commitment to user privacy and security. The fundamental differences in how various messaging applications handle key concepts and security mechanisms pose significant challenges for interoperability. For instance, Threema employs anonymous IDs for user identification, while WhatsApp relies on phone numbers. This disparity means that any attempt at interoperability would necessitate compromises, ultimately diminishing privacy protections to a common baseline. Such compromises could adversely impact critical areas like data protection and metadata minimization. Furthermore, once data is transferred to WhatsApp, Threema has no means to verify its processing or handling, particularly given WhatsApp’s closed-source nature.
Potential Monopoly Reinforcement
While the DMA aims to encourage competition, Threema is skeptical that interoperability with WhatsApp would genuinely diversify the messaging ecosystem. In fact, the opposite effect could occur: if users can communicate with their Threema contacts directly through WhatsApp, the incentive to download and actively engage with the Threema app diminishes. This scenario could inadvertently reinforce WhatsApp’s dominant position in the market, rather than challenging it.
Impact on Business Model
Threema’s business model is intricately tied to app sales, which serve as the primary source of revenue. A decline in app downloads due to interoperability with WhatsApp could jeopardize this revenue stream. Unlike many competitors, Threema does not rely on advertising, donations, or the monetization of user data. Instead, the company is committed to financing its development through direct app purchases. The need to sustain this model is crucial for ongoing development and the potential creation of an interoperability interface with WhatsApp.
In light of these considerations, Threema has firmly decided against pursuing interoperability with WhatsApp. The company’s unwavering dedication to privacy and security remains paramount, and it is unwilling to compromise these foundational principles.
