I haven't built my coop. I was burned in a previous game by playing with strangers so I am very hesitant to do it again. I can still play and enjoy the game without it.
I don't necessarily consider it being unfair to have the task but more of a programming failure on the part of Playrix because they already have programming in place to not hinder those that do not have a feature of the game. No zoo, you don't received zoo cards. No House of Luck, you don't receive clovers. No Museum, you don't receive artifacts. An alternate task could have been programmed for those that don't have the coop. Doesn't help the solo racers though.
I won't be able to finish the task but so far I can do everything else and if the calculations are correct, I will still be able to get all the points needed.