In-game timers that make you arbitrarily wait for something.
"Weapon upgrade (the wait time is ranging from 2 minutes all the way up to 10 hours!)"
"the game does have a stamina feature. when ever you level up in the it now fully refreshes and give over the limit if you can hold it all. a lot better than it was a couple of years ago."
"You can complete the Portal task once a day, and then wait for the countdown to play again the next day."
"In order to unlock new cards you need credits. In order to get credits you need to complete missions. You get two missions every 8 hours or have to refresh them for gold (which you can buy for money). You can play without completing missions but it will not count towards your collection level making it seem pointless."