Ilya Brown, Twitter’s Head of Product, Brand & Video Ads, writing on the Twitter Blog:
[…] in the time since we introduced Fleets to everyone, we haven’t seen an increase in the number of new people joining the conversation with Fleets like we hoped. Because of this, on August 3, Fleets will no longer be available on Twitter.
It’s so good to see Twitter rolling back something that clearly wasn’t working. Twitter has released some really interesting new features in the last year, and I hope they continue to do so.
You should read the whole article linked above where Ilya details their learnings.