text: your authoritative source would be the feedback a customer provided.  i fed the name into a search engine, in particular, google, and was greeted with results that would confirm this general location, as well as an IPv4-only website i couldn't view, which would tend to confirm the customer input you received.
  
  however, the customer did not provide the address info, and the precise location may or may not be exactly at this marker, as i cannot view imagery either.
  
  while you cannot copy from google maps (one of the results), and some mappers would frown on the use of google search to link to an amenity's own page, you are not copying the information from either but rather, using them to judge if the customer input is correct and accurate, and the business clearly exists, and at worst, with the street names north-south, it would be no more than a city block off of position, with no clue as to whether this block is numbered from 0-100 or from 100 to 200, the latter, more common, matching the found address from the search.
  
  i'll repeat that an open legal source is only required for copying information into osm, which you would not do, as you are copying mapbox customer information after verifying it against multiple other sources.
  
  if your mapbox policy you operate under requires on-the-ground in-person confirmation, that is something different, but most mappers reviewing notes will be going by similar sources for verification, being unable  or unwilling to visit in person for such a single POI, particularly when the list of beers isn't enough to raise me from my comfy chair.  quite the opposite, in fact.