Just helps to visually illustrate how far a virus could be spread if any of those people on the beach had the virus. Not really useful now, we are well beyond the “contact tracing” phase.
Same thing could be done inside a Costco when people were hoarding toilet paper. It means nothing. We're humans and we interact - at least we did until we were forced into a nonsensical fantasy that we can control billions of ubiquitous organisms that we can't see, smell, or feel.