It's somewhat this, a lot the fact that a huge, unbelievable chunk of "devops" guys are former sysadmins pigeonholed into devops because every organization thought that was a natural progression, so the odds of finding a devops engineer that is very good at writing go or javascript is kind of a unicorn, at least in my experience (I have to hire sometimes). They're usually fairly proficient with scripting languages, but sometimes not even that. Since terraform/HCL/YAML are more configuration languages with a lot less "logic" in them, it's more comfortable for a lot of people with that background, especially when they're already used to tools like ansible/helm/etc.

uh-huh: https://github.com/earthly/earthly/blob/v0.8.15/LICENSE (MPLv2, just like TF used to be) https://github.com/dagger/dagger/blob/v0.15.2/LICENSE (Apache 2)