Happens all the time
People who google for cheats or free loot will likely see sites that:
a) Insist you complete a bunch of scammy links (often requiring credit card authorisation), to receive a code that doesn't work.
b) Malware
c) Both
Anything that requires you run special software, or fill in stuff is malicious. Sadly with a game like Fortnite, many of the players will be kids who are less likely to be security conscious that adults. Not that some adults are security conscious either.
Search engines and sites like YouTube could do a lot more to stop these kinds of sites. Even if they popup a prominent message about game scams and how to avoid them.