Numbers I found vary but Tesco has around 3500 stores in the UK alone alongside other chains they have a hand in. They also have a large online presence, click and collect operations, estates, data collection schemes and a whole logistics network to operate. I'd have actually thought it would be higher than ~11 VMs per store.

That works out to ~11 computers/licenses per store, which sounds a tad high but also very easy to do if you let new system accrete over time and factor in the need for offline operations and redundancy across regions.