[ranman]

The parent comment is neither factual nor advisable.

You build greenfield in cloud precisely because it is greenfield and the utilization isn't well understood. Cloud options let you adjust and experiment quickly. Once a workload is well understood it's a good candidate for optimization, including a move to self managed hardware / on prem.

Buying hardware is a great option once you actually understand the utilization of your product. Just make sure you also have competent operators.