Oh for *'s sake. Companies and institutions are desperate to justify their AI investment any way they can. They would have gotten a perfectly good estimate by

Oh for *'s sake. Companies and institutions are desperate to justify their AI investment any way they can. They would have gotten a perfectly good estimate by taking some photos of the crowd at different density areas over the day and doing some good old-fashioned sampling and extrapolation. Something that could be done by primary school students (and is done, remember counting cars or sampling insects on field days?). Just because you can, doesn't mean you should.