I think having multiple deployment stack options will only help more adoption, and is a practical choice that will drive more decentralisation.

If you had to use Amazon, sure. But the option would be nice.

That said, I’ve tried supporting both DynamoDB and an RDBMS with the same software and it was a pain, and this was for something with a less complicated schema then Mastadon. I think what’s missing here is really a scale-to-zero, serverless RDBMS (maybe Supabase or Neon fit the bill?)

Decentralisation isn’t about never running things on a centralised stack. It’s about not having to.