What is a startup? Not only are they desperate guys who are tired of 5/2 work and have an idea for a million, but they don't have this very million yet. They are also big companies that have new business opportunities - new products, directions, niches or markets. The development of a project startup usually involves its future monetization or sale, and most likely, the interaction of a large number of users with the volume functionality.
That's why it's necessary to build a more reliable and secure architecture, which will be sensitive to scalability (implementation of new functionality and optimization of the previously developed one) and uninterrupted operation in moments of high load.