>>714384847
Fortnite started this 'collab culture', I want to say in 2018/2019 when they did the Marvel shit
About the same time as Warzone came out (MW2019), which meant it was given that CoD would follow suit
A more simple answer is that it sells. Some like Nicki Minaj. Others think it's funny to kill people as Nicki Minaj, etc. etc.