Listen, I have no problems with collaborating...that is how a lot of us locate and determine if certain branches we are working on will fit into our respective trees ( if they are a part of our family) or not.
But yes, I do agree with someone giving you their information and you importing it to your Geni tree (or personal Family Tree Maker, etc files), and changing the info, and even claiming that the information is yours, instead of giving credit to the person that you got it from in your sources.
Please remember...geneology information is usually a conglomoration of mutual information from different sources, and if you did not so the work researching it, you should not!!! take credit for it.