Twitter Fleets are being removed after just 9 months.
As of the 3rd August users will no longer be able to access the Fleets feature. This is because Twitter has stated that Fleets hasn’t met its goals. They had hoped that Fleets would encourage more users to ‘join the conversation’ and expected to see an increase in new users and activity from existing users.
Unfortunately this isn’t what happened, with the majority of use coming from already active existing users. Twitter has said that it’s not a total loss. They will use the things they learned from Fleets to inform other updates to the platform.