Thanks for the comment. Yes commodity infrastructure is not the only reason, less complexity at the start is another reason. However even though monolith are less complex at the beginning, you will eventually most likely spend a lot of time and resources switching to a scalable distributed pattern like microservices, specially when the code base starts to grow massively and you start to hire more people to work on the same code base! So our post was more about whether startups should jump straight to microservices from the beginning and highlight the current low barrier of entry regarding infrastructure, tooling etc.
Of course there are cases like Etsy who are reported to so far resisting the temptation of moving away from monolith because it works for them!