"Keep your searches private by redirecting searches that may be tracked to Search Encrypt, a privacy-focused search engine... For your privacy, Search Encrypt intercepts the requests if it's on our list of sites"

So it says it hijacks right in the description.

On their website for their "search engine" it says

"The Search Encrypt encrypts your search terms between your computer and searchencrypt.com. Search Encrypt is supported by sponsored ads featured on our search results page."

Which obviously (to you and me anyways, not to others) is also done at Google so there is no actual benefit other than Google doesn't get your data.

My conclusion is that, yes, they are scummy and taking advantage of fears of people to make a buck. But is it an outright scam? Not so clear.