If you stop playing you'll miss out on something or be left behind and unable to catch up.
"They constantly have events and things going on to encourage you to continue playing consistently."
"Limited time events occur regularly, usually offering a gold character for free. If a player cannot complete all parts of the event, they miss out on the character reward."
"You'll miss frequent events for premium tanks (that are really hard to get anyway). New OP tank lines are released frequently and the first ones to unloch them wreck havoc in their tiers."
"Game encourages players to raid or war daily. If you do not partake in these events you risk potentially getting lesser rewards or kicked from the your alliance (guild) for not participating in the daily grind."
"Wars especially mean you have to blankly stare at your screen for a 48 hour window. Some factions have shifts you have to play so that enough people sign up."
"Gameplay revolves around two week events with limited-time resources that can practically never be obtained outside of that window"
"Events are limited time and reruns typically only happen once per event"