I am baffled my the ability of Happysoup.io to access my salesforce org. I did not create a connected app or did anything else to connect my Salesforce org. A simple login. 

The documentaion on it's website mentions creating a connected application if we want to host the application on premise.  

I looked into 'Connected App Usage' - there is an entry for 'Heroku Connect' - I did not create this app - Neither do I see this app under Connected Apps list!

Has Salesforce 'behind the scenes' made it possible for Heroku apps to integrate with Salesforce - by embedding a Connected app in all Salesforce orgs by default? 

Could someone please help me explain how is HappySoup able to connect to my Org?