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Fortnite and some other online games require EasyAntiCheat. This tool monitors your PC while you’re playing, attempting to stop cheats from working in the first place. If it detects a problem, you can be banned from playing the game online.

Source: https://www.howtogeek.com/358756/what-is-easyanticheat.exe-and-why-is-it-on-my-computer/