blocks.md (The Software) is a JavaScript library that takes your Markdown files and turns them into forms and web pages. Since it is a library that can be installed via npm, you can integrate it into your product. In that case, you need an Enterprise license.
What is not an integration?
If you're using The Software to just create forms and web pages (no matter where they are hosted), you are not integrating into your product. For example, your company may choose to run a survey or gather customer feedback. These are examples of usage that are not integrations. In such cases, you only need a Standard or Multisite license.
What is an integration?
If your user is interacting with The Software and not just with the output created with it (forms and pages), then it is a possible integration. For example, if you are a SaaS that allows your customers to build forms, and those forms are built using The Software, then that's an integration into your product. In most cases, common sense should suffice. However, if you have any questions, please send us an email or book a call.