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For Zulip, I’ve only used it on the web. Apparently they have iOS, Android, Desktop, and Terminal clients.
For Matrix, there are many clients on all platforms, but none have ever stood out to me. Element is the official client, and it’s… fine I guess.
Well, to follow version 3 of the GPL, you do actually need to provide effective root access.
Specifically, version 3 of the GPL adds language to prevent Tivoization.
It’s not enough to just provide the user with the code. The user is entitled to the freedom to modify that code and to use their modifications.
In other words, in addition to providing access to the source code, you must actually provide a mechanism to allow the user to change the code on the device.
The name “Tivoization” comes from the practice of the company TiVo, which sold set-top boxes based on GPL code, but employed DRM to prevent the user from applying custom patches. V3 of the GPL remedies this bug.