Tulips were sold for ridiculous prices, yet nobody used them.

That would be the P/E ratio. Luckily Red Hat is a public company so you can know both the P and the E. :)

Revenues in FY2017 were almost $3 billion per year.

are you suggesting that RHEL has been a bubble?

No. I only proved that the logic in the upper post was not sound. You make out of that what you want.