Darktable doesn’t typically auto-apply a full imported style directly as the default. The usual approach is to recreate the style as auto-applied module presets.

How to do it:

1. Import the style.
2. Apply it to a sample image in darkroom.
3. For each module changed by that style, save a preset from the module’s menu.
4. Enable “auto apply this preset to matching images.”
5. Set the preset rules to match your camera brand/model (and other criteria if needed).

Tip: in lighttable, hovering over a style shows which modules it uses, so you know which presets to create.

One exception mentioned is base curve: if your style depends on disabling it, you may need to explicitly handle that with a preset, since newly imported images may have it enabled by default.

A literal alternative is using darktable’s Lua scripting to apply a style on import, possibly filtered by camera model, but module auto-presets are the more typical solution.