Gobble was started in 2011 as a marketplace for home-cooked food. By 2014, they had become a pre-cooked meal subscription service as part of YC. Neither model really took off, so in September they pivoted again - this time to meal kits.
Dollar Shave Club has had quite a ramp leading up to their $75M round. Since launching their subscription service in March 2012, they've grown to $100M+ ARR and have yet to lose steam.
In the months before their Series C, Munchery acquired a large number of low-quality customers. While this doubled their customer base, revenue increased just 30%.