"Live Service" or "Games as a Service" may be the vocab you're looking for. The game exists as a monetization engine. Some amount of fresh content is required

"Live Service" or "Games as a Service" may be the vocab you're looking for. The game exists as a monetization engine. Some amount of fresh content is required to keep feeding the machine, but the goal is generally to let the machine run while dropping in bits of content and purchasable junk for the players to consume.