I think that they wanted to bring humanity together. By landing all over the world they’re kind of forcing us to cooperate. And once the specialists decipher it and figure out its grammar and vocabulary they would start teaching other people.
I don’t think releasing it to the Internet would’ve been very helpful. It would still be the linguists doing the deciphering. But without a point of reference or an actual speaker (or an air drawer) of the language, they wouldn’t have been able to do that. People weren’t able to decipher the Egyptian hieroglyphs before the Rosetta stone was discovered, and those depict things from Earth.
Learning a language is a social thing. We have plenty of resources for learning foreign languages by ourselves, but many people still choose to go to a course or hire a tutor. You need someone with a thorough knowledge of a language to guide you through the subtleties in pronunciation and meaning (and time travel giving abilities in this case).
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