Some startup clients have the most bizarre ideas in terms of tech stack and expects us to pull if off!

Keep calm and pull yourself off before pulling smth technical

We decide on the tech stack, not the clients!

Decentralized serverless Blockchain ARM containers on client-side using WebAssembly and in-memory GPU?
Built using a no-code framework leveraging portable AI chatbots?

Looking for more stack buzzwords to add to this word salad.

That being said, this is pretty much what clients expect from "startups". The bare minimum is to reinvent software itself and become a two-trillion dollar company in a month after an investment of $4.95 and a slice of cold pizza.
Otherwise they will just hire the teenager next door that promised them the world.