From Marvel Studios News:
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The Avengers: Infinity War trailer proved to be the most anticipated trailer of all time. It broke a record with 230 million views in its first 24 hours. Moviegoers were undoubtedly impressed by what they saw, but star Chris Hemsworth initially thought the audience needed more.
Hemsworth liked the trailer, but he worried that the audience was not given enough information. As he tells, IGN, it was co-director Joe Russo who convinced him the trailer showed all that it needed.