Reading your comment and the answers, I have a hard time telling if you're being ironic or serious here. I'm going to be charitable and assume yours is some very sharp wit that flew over the heads of some that replied to you :)

Indeed it is a terrible idea to optimise any piece of software that's put online in the rare occurrence it becomes the next Facebook. No, it will not happen overnight. No, you can run on an autoscalable k8s on AWS setup and it will still break, you will have to completely re-architecture and write a lengthy "what went wrong" post-mortem anyway.

I feel the "premature optimisation is the root of all evil" mantra is not yet being taught in DevOps school.