I don't think that's necessarily a problem. When starting a new product time to market as well as identifying the user needs feature wise is way more important than being able to scale "Infinitely".

It makes sense to use whatever $tech helps you get an MVP out asap and iterate on it. once you're sure you found gold, then it makes sense to optimize for scale. The only thing I guess one has to worry about when developing something like that, is to make sure good scalability is possible with some tinkering and efforts and not totally impossible.