They took the easy way out. They built it in AWS to avoid the infrastructure costs and to save programming time by using the various AWS services for storage, application messaging, database and elastic scaling. They are screwed now because they built Parler around AWS-specific technologies and will need to re-architect and re-code everything to convert to another platform, even if it is one they control. They locked-in to a single vendor and it bit them in the ass. This is why companies should avoid the cloud platforms.
everyone knows you never make the product dependent like this, you use adapters this way you can swap out the database/messaging without affecting the calls from the app. This is literally why the adapter and proxy patterns exist
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