why not use the Periscope brand as their Stories feature? Instead they use something new called Fleets?
Kind of like how I’ve never seen someone call Periscope by name as people just say they’ll be streaming on Twitter.
Similarly I doubt I’ll ever see someone use Fleet to refer to a Twitter Story.
Fleet and fleeting don't really have much overlap in terms of definition. Presumably Twitter was going for the latter meaning, but went with the former.
That is definitely not the best product association.