If you are getting notifications from InitiatorActivity, then your Mac is infected with adware. InitiatorActivity is adware for Mac.
InitiatorActivity changes setting in your Mac. First, InitiatorActivity installs a browser extension in your browser. Then, after InitiatorActivity 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.