You can calculate a statistical confidence interval. If you randomly draw 21 from a group of 30, and zero accept sats, what are the chances that any of the remaining 9 do? In fairness, I wasnt able to talk to people at the venues that were temporarily closed, but there was also no indication they would accept sats. I reached out to the community, talked to the supertagger and others of the BTCMap team. If any of these venues really were to miraculously take Bitcoin, it would be easy to add them. If the bar to add venues is so low, the bar to remove them has to be as well.