You missed the hint about the domestic violence?
Lyft and Uber do not enable binge drinking, they enable social binge drinking. The violent drunks I knew of growing up were plenty content on getting hammered at home and becoming violent. Most would become violent well after they would have been cutoff by a bartender.
Also, yes, it is worse when the person is drinking out of the home, because that means family members have a lot less control over the drinking and less warning.
And domestic violence really doesn't have a high requirement of blood alcohol level. Even very minor levels can disinhibit a person, especially if he is already habituated to act out on his family members.