Ubuntu Touch App
Presently in the mobile operating system of Ubuntu Touch it is a cumbersome manual process to get a VPN working. Given that such users are a privacy focused bunch, and with Volla and Fairphone offering Ubuntu Touch as a pre-installed operating system option, it might be worthwhile for Proton to make an Ubuntu Touch port of the ProtonVPN app. Shouldn't take too much change to an existing Ubuntu compatible app, and would certainly garner new Proton subscriptions as the only easily set up VPN for the OS.

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Fynsk commented
I completely agree with @Grasslands! It is crucial to build a strong and independent Linux ecosystem, especially to reduce reliance on big tech corporations. Ensuring that services like Proton Mail work seamlessly on Linux-based platforms—without being tied to proprietary ecosystems—is essential for digital freedom, privacy, and user control. Open-source alternatives empower users and create a more decentralized and resilient internet. Hopefully, Protonmail will prioritize better native support for Linux, including Ubuntu Touch!
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Grasslands commented
I would love this too! Building up the linux ecosystem should be the main goal of proton.