In the last 15 years that I've seen this type of clickbait, 100% of the time it's written by someone who doesn't know how to make a TCO calculation. Of course, this time was no different. Should have saved myself the agony after reading the first sentence: "Clouds for IT infrastructure are so popular lately that moving into the cloud has become a trend.". Please.
They didn't have 'the phone'. They only had traffic logs and had to find the app that matched a certain traffic pattern. And they did have 'something like ElasticSearch', it's all in the link, and even in this reply.