Video ads on Twitter feel more relevant and less intrusive because:

They display only in a creator’s profile page.
They only display in the timeline if they are forwarded or liked by someone you follow.
They display within the timeline as normal Tweets (although marked as Promoted).
They display within the timeline as normal Tweets and are not marked as Promoted.

The correct answer is:

They display within the timeline as normal Tweets (although marked as Promoted).