Hello @Marvin,
It seems what you describe is mostly relative to the Data Proxy, which is one of the features of the Prisma Data Platform.
We are working on other features besides the data proxy that we think our users will find very valuable, but right now the data proxy is probably the most relevant and crucial if you are on serverless.
TL;DR No, you are unlikely to run into these issues.
PlanetScale supports a higher number of database connections than other traditional RDBMS providers, 1K on the free plan, 10K in the Scaler plan with the ability to pay for more.
You won’t have cold starts if you go with a traditional stateful backend because the connections will frequently kept warm and reused. And the overall number of connections needed is much lower when using stateful servers like containers.