People with default settings are 95% of the users. You are not improving privacy if you ignore 95% of your users.
We ask users to define a DM relay by themselves via popups and in the relay list. This will be even more front and center in the future.
Last time I saw it, setting up a Nostr DM relay is a lot easier than setting up a SimpleX relay for myself.
The simple fact that Amethyst does not run a DM relay already makes us better than SimpleX. There is no single point of failure that a court order could target to break people's privacy.