It actually isnt selfish. That is the owners of those platforms business. Aside from the cards and DEC, there are owners of Splinterlands. Them marketing the game and growing their asset is what a business owner does.
Their responsibility is to Splinterlands. However, the success of that game helps all that is tied to Hive. It all builds upon itself.
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I know. That's why I put it in quotation marks.