It surprises me how many people try to build an MVP before looking at the existing competitors :)

Graze.com has been doing a recommendation-engine driven snack delivery service for several years now (they raised a $2.5m VC round from Octopus and DFJ) and are making revenues in the high millions.

Graze have a pretty proven business model by this stage, but given they only operate in the UK there's obviously the potential for someone to clone their business in other countries.