The price to sales (P/S) ratio for all the examples are quite high in my opinion.
Eg. At PS of 5 times, it will take a company 5 years to accumulate revenue that is equal to its market cap. We haven't even talk about profitability.
"In technology, the average price/sales ratio historically has been about 2X sales, according to Factset research."
https://www.futuriom.com/articles/news/three-reason-why-tech-stocks-may-have-topped/2019/05
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