STOP DESIGNING YOUR WEB APPLICATION FOR MILLIONS OF USERS WHEN YOU DON'T EVEN HAVE 100

Summary from the TLDR Web Dev newsletter

It doesn't make sense to over-engineer web apps by focusing on scalability from the beginning, especially when the user base is still small. Spending time and resources on building for millions of users before even having 100 users is a waste of time and money. It is more important to focus on creating a product that people want, gathering user feedback, and iterating quickly.