> If it's so simple, Pulumi could have done this themselves. Why didn't they?
Because that would be a waste of time unless there's some specific case where an existing provider is insufficient.
> Would Pulumi have been as successful without leveraging the vast ecosystem of existing Terraform providers? Now they are a growing Terraform competitor.
Pulumi itself is free software, just like Terraform was (and hopefully still is). There is literally nothing stopping Hashicorp from doing the exact same thing in the opposite direction.
