I know this is bait... But DE (Digital Extremes). They release monthly, sometimes weekly, content for Warframe for free. And they aren't small updates, they're fairly large updates always adding more to the game. Not to mention that the game and all the updates are free.
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It's a free to play/pay to get ahead game. Bungies micro transactions are only cosmetic. Totally different games, can't even compare them.
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Rocket league gives out PERMANENT content for free all the -blam!-ing time bro. I don't think Crimson day is anything special. It's a doubles game painted red....woahhhh
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Microtansactions have nothing to do with what you said. You asked what company puts out free content without asking for money and claimed that no company does that other than Bungie (which is a lie btw). I gave an example and proved you wrong. Simple as that. They put out free content weekly and/or monthly without asking for a single cent.