If you are getting notifications from ReviewVenture, then your Mac is infected with adware. ReviewVenture is adware for Mac.
ReviewVenture changes setting in your Mac. First, ReviewVenture installs a browser extension in your browser. Then, after ReviewVenture hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.