this is not always necessarily true.
you can use the "name" bitcoin in your product without any issues but when it comes to a "logo" things are different. logos are designed by designers and it is their intellectual property so they own the copyright for it. you can only use it IF they allow you. since the orange bitcoin logo was placed in public domain and for free use, he can do it. otherwise there may be another bitcoin logo design by someone else that is not "free to use".