'docker compose with profiles

I fail to understand how profiles work in docker compose.

So, I'm having two services defined in the docker-compose.yml

services:
  db:
    (...)
    profiles:
      - default
      - db
  app:
    (...)
    profiles:
      - default

When I run docker compose --profile db it indicates correctly to run only the db service [Running 1/0]. However, the app is also "attached".

How can I prevent the app being attached?

docker docker-compose

Sources

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