LogFAQs > #963955219

The entire point of them is to make players want to play more, and make them more invested in playing. If they can keep you coming back at least once every few days, you are more likely to continue and more likely to spend money in the future.

Even when Fortnite was the only one doing it, they wanted the same damn thing continuous players that are more likely to buy, and even if they stay F2P it keeps the servers full of players and keeps the game active.