What sense it has to set copyright info when creating app in iTunes Connect?
Apple does not assume who owns the copyright. The copyright field is provided for you to explicitly state who claims copyright for the uploaded product.

Apple's iTunes Connect documentation states:


  Copyright (required) The name of the person or entity that owns the exclusive rights to the app, preceded by the year the rights were obtained (for example, 2014 Example, Inc.). The copyright symbol is added automatically.


Copyright is a large and complex issue. If you are unsure or have legal questions, you are best contacting a legal expert for the jurisdictions you intend to operate within.

You may also find this question helpful, Understanding copyright field in the iTunes Connect app submission.