There are no hard figures on this, but anecdotal evidence indicates that bars and restaurants are seeing differences in their traffic and revenue, reportedly due to dating apps like Tinder increasing the number of first dates. And they're making changes accordingly.
Food and beverage industry insiders have reported noticing more traffic during non-peak times and days. More traffic should be a boon, but some related trends seem designed to hurt their bottom line. Staff have noticed signs of first dates, like people taking up seats and not ordering while waiting for their dates, some ditching their dates after a short time (or worse, upon seeing them) and lots of long, sometimes awkward, conversations between people who are obviously just getting to know each other. These dates, whether they go well or not, seem to be more casual, and along with that, longer and cheaper. The couples are reportedly ordering less, sometimes only drinks, and not too many of those.
According to a 2015 survey by Match.com, 2.5 hours is the peak date length that makes a second date more likely [source: Fisher]. So it's good for daters if this happens, but not so good for bars and restaurants when their seats don't turn over to accommodate more paying customers. Some establishments are changing their layout and furnishings to accommodate more first dates, for instance adding more two-person tables so that daters aren't taking up four-tops, and replacing couches with chairs arranged for couples.
It's not all bad blood between restaurant staffers and daters. A bar in England posted a sign with the heading "Tinder Date Gone Wrong?" in the women's bathroom (and later the men's) to instruct patrons on how to notify the staff when they need to be rescued from a bad situation.