Being forced to play according to the game's schedule instead of yours.
"Bunny derbies require you to be playing the game during certain times of the day for additional rewards."
"You are forced to open the game at various times of the day to claim energy that expires after 2 hours."
"shields that expire in 4, 8, 24h and 3d, if you don't renew shield your castle can be attacked and cleared of resources and troops. Resources and heals to troops, walls etc take too long, real money required to speed up process"
"The most egregious example is castle events. In order to progress through each castle level and open chests, the player must collect a type of currency exclusive to the event. To earn said currency, players must complete a set of tasks every 6 hours. In order to have the best chance of winning the prize dragons from the event, players must try to collect as much event currency as possible. This forces players to adjust their real life schedule to be able to play the game every 6 hours."