I think there are ways to make it worthwhile to fund permanent chats for free users. This is a major pain point because most people want their chat history to be permanent.

My ideas:

Personalize Lumo’s appearance. Some users form a bond with the AI they use, and Lumo is one of the few assistants that actually has a visual persona. Proton could turn this into a Lumo + feature, allowing users to change Lumo’s colour, add a collar, or dress it in outfits.

Redo‑reply option. Not many users need this frequently, so it could be a premium‑only feature, or free users could receive 1–3 free redos per month.

Conversation mode (voice‑to‑voice). While other AIs already offer it, it isn’t essential for Lumo, but adding it as a Lumo + perk would make the subscription more attractive.

More interactive elements. Enable users to pet Lumo, play with it (e.g., a laser‑pointer mode), or otherwise interact with the avatar. Such playful interactions would differentiate Lumo and could justify an additional fee.

Thank you for reading this post; I hope you’ll consider these suggestions.