An online acquaintance described it like this:
„You build your tool to reduce grinding. After a while, building the tool becomes a game in itself. One where you make the rules“
Multiplayer online games nowadays heavily rely on small repetitive tasks to regulate the pace in which you proceed in your competition with other players. Duel a player once and win to earn a point. You have enough energy to duel 10 times. Then you have to wait to regain your energy. If the designer did a good job, it’s fun at first. After a while it gets boring, but you have to do it to compete.