No, there is 100% nothing you are obligated to do.  If you would like to have us look at your property, just tell us about it and we will call you to learn some more.  We then make a 100% cash offer that makes sense to us and is the best we can offer you.  Then you have pure autonomy to decide if you want to sell the home to us or not.  We will not harass or hassle you.  Its easy and up to you completely.