Here is what Alexis had to say answering this question in the comments section of his site:
alexis ohanian said...
I believe the biggest thing was the dangers of dealing with both cellphone carriers (this is pre "AppStore," remember) who are notoriously closed and slow-moving as well as restaurants, which aren't typically very tech-curious (all the ones I spoke with were taking online orders via fax).
alexis ohanian said... I believe the biggest thing was the dangers of dealing with both cellphone carriers (this is pre "AppStore," remember) who are notoriously closed and slow-moving as well as restaurants, which aren't typically very tech-curious (all the ones I spoke with were taking online orders via fax).