Use Case Difference between CiviCRM and Croudfunding Sites?
I totally agree with Pete. To put it more bluntly, to me it sounds as if you are saying that a pushbike is the same as a car as they can both be used for transport :-) Or that a calculator and a spreadsheet are the same type of software as you can do sums with them :-)

CiviCRM is a full blown CRM that offers functionality for fundraising, event management, membership management, relationship management, case management, some automated workflow. A crowdfunding site supports fundraising with crowdfunding, full stop.