People may use any reliable source to provide an answer to questions posed on RG. A researcher may want to gather more fact via Google search before answering your question. I think it is not an unethical practice.
A researcher who has an account in social network, would have googled for the answer. Once not found, he posts the question in the RG. Answering from Wikipedia or from google search may not be unethical, but waste of time and resources.
Because the researcher is seeking for an answer from different sources and angles especially from the experience and expertise of the fellow researchers.
As Vyacheslav put it, the answer is easy. They want to get some mostly seeming advantages without thinking and pain. This is the cheapest way to fatten the vanity. The problem is that many RG peers evaluate this copy work as real performance. Brave new world. How ethical may be these supporters of cheating?
It may be partly true. Sometime people really have opinion but they don't find appropriate words due to lack of writing skills, command over English language etc. barriers so they may prefer to take assistance from search engine.
Easy to search, easy to find and then one can add to it based on your own experiences gained so far and also on future direction-imagination/speculation/possibility, etc . I still remember about how to write essay on say: school, picnic etc. one can use your imagination and involvement in various types of activities. How best to make use of your -communication skill, creativity, imagination etc.
In fact, using Google is not a problem to obtain some definitions or facts. But, the big problem is answering the questions by copy-past style, which is reduced the quality of the answer.
It is important to write your own words and focus on the answer as a reference.
Either due to the fact that your question is a general question, and therefore easy answer through the cockles of your question or a difficult search for Answer it requires.
People answer your question with a web search because it's easy to do, sometimes.
My personal reaction to answers that consist of nothing more than a link to an article is that they do not deserve an upvote. Not unless the link is accompanied with some original thoughts from the responder. The responder should show that he's grasped the material, has a perspective on the information, and generally provides added value beyond just finding the link.
Aside from that, use of search engines ought to be fine for research. It's a heck of a resource these days. And search engines frequently lead to primary sources, which certainly no one should have any objections to using?
I also agree with Albert. Before posting the question, the researcher must have searched the web resources. As Albert says, if the link is associated with his thinking and analysis of the issue, it is fine. Otherwise, it will not provide any constructive idea to the researchers who post the questions.
Also, this does not indicate that the person has less knowledge.
Almost researchers verify before posting and rearrange the word according to Google answer, this is a good reaction in general but a very poor habit in research.