Has a metric ton of content at a high quality for a free to play game, that is constantly being updated by developers that are likeable and actually communicate well. More recent updates (except the open worlds) are held back till later into the game. Essentially, the further you progress, the more the gameplay and story expands which incentivises playing even more.

Microtransactions can be used to buy upgraded versions of Warframes, weapons, cosmetics and the premium currency, Platinum, but all of these can be earned through gameplay and trading.

Has a metric ton of content at a high quality for a free to play game, that is constantly being updated by developers that are likeable and actually communicate well. More recent updates (except the open worlds) are held back till later into the game. Essentially, the further you progress, the more the gameplay and story expands which incentivises playing even more. Microtransactions can be used to buy upgraded versions of Warframes, weapons, cosmetics and the premium currency, Platinum, but all of these can be earned through gameplay and trading.