Relationship routes are created without adding them in the routes.rb

I've defined the following Resource:

class CommentResource < BaseResource
      has_one :activity
      has_one :user
end

 class ActivityResource < BaseResource
      has_many :comments
end

jsonapi_resources :activities, only: %w(index show)
jsonapi_resources :comments, only: %w(create destroy index show)

And checking with rake routes I see that it also created all the relationship/related routes for both Activity and Comment even if I haven't added jsonapi_links / jsonapi_related_resources in the routes file

Start with the resource declarations and the routes.rb configuration shown in the issue, then reproduce the output with rake routes. Trace how relationship and related routes are generated for ActivityResource and CommentResource. Done means the route list matches the relationship declarations and the explicitly configured route options.