The streamingsearch.xyz address belongs to a fake search engine that is being promoted via a browser hijacker application. Browser hijackers are intrusive applications designed to take over the user's Web browser specifically. Typically, they modify the homepage, new tab page, and the default search engine and set them to open the promoted address, streamingsearch.xyz in this case.
Users may not have even realized that such an application has managed to invade their system until the consequences of its functionality become visible. The explanation is quite simple - browser hijackers, adware, and other PUPs (Potentially Unwanted Programs) are all distributed via deceptive tactics such as bundling and fake installers/updates. If the users do not pay attention and check all installation options, they might miss the fact that additional apps will be installed.
PUPs also are known for possessing data-harvesting functionality. These applications might be spying on users' browsing activities by collecting the browsing history, search history and clicked URLs continuously. In addition, they also might transmit numerous device details (IP address, geolocation, ISP) and, in the most severe cases, even payment details if such information has been saved in the affected Web browser.