Are the verbs "kick off" and "launch" interchangable?
Which headline sounds better?
Facebook launches (OR kicks off) Get Digital education platform in Ukraine.

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I would say launches.

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'kick off' is informal and also means to start a football match
'launch' more formal

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They are similar but when it comes to this digital example launches is far superior.

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Yes they have similar meanings

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Kick off the xyz promotion with great discounts.  Kick off the baseball season, winning over xyz....kick off does mean launch or start something. Launch also means start something.  I think kick off originally came from football the beginning of the game they kick the football.  Launch is like to fire the rocket into space. I think it is all in the phrase you choose whether it sounds natural... sorry that’s my best non professional opinion..