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Tron foundation has money to throw around. Perhaps they made an offer to Steemit, Inc that it could not refuse. Knowing that all the Steem blockchain development is done by Steemit, Inc, Justin Sun decided to take over the chain to make Steem users into Tron users. Tron has money but few users.

People hate on Tron and i get why but one thing it has, that is the most important thing is network effect and simplicity. Call it what you want, the tech is not the best out there but this is not what matters. Adoption is what matters. Ask JVC about VHS.

Tron has great marketing. I don't know anything about the quality of the chain. It's a DPoS chain.