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HashiCorp adopts Business Source License
(www.hashicorp.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Then you are good either way. All of the IaC tools generally revolve around the same principles, they just express them in different ways. Learning terraform is definitely not a waste, you'll be able to transfer what you learned to other tools like pulimi, CDK or what have you pretty easily.
If you were to buy into a technology for a long time project, then I'd encourage you giving the alternatives a closer look.