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To play devil's advocate, many successful developer focused companies have gone down this route successfully. Neon, Cloudflare, Firebase, Github and many more have all made free tiers work.

I suspect there's a special dynamic for developers. I'm usually more willing to try out new things on personal projects, but I also don't like paying for things on personal projects. At work I don't care how much things cost, but I'll definitely advocate for tools that worked well on personal projects.