- In the event that you are working with different cloud providers, Terraform is one thing to learn that then applies to all of them, as opposed to learning each provider's bespoke infra-as-code offering. Most companies stick to one PaaS/IaaS, but individual personnel ain't necessarily as limited over the courses of their careers.

- Not all cloud providers have an infra-as-code offering of their own in the first place (especially true with traditional server hosts), whereas pretty much every provider with some sort of API most likely has a Terraform provider implemented for it.

- Terraform providers include more than just PaaS/IaaS providers / server hosts; for example, my current job includes provisioning Datadog metrics and PagerDuty alerts alongside applications' AWS infra in the same per-app Terraform codebase, and a previous job entailed configuring Keycloak instances/realms/roles/etc. via Terraform.