IntelliJ IDEA Ultimate Free Trial

Hi JetBrains support,
I have one question about IntelliJ IDEA Ultimate version.
I installed it and started a free trial. But it showed a message that it is an evaluation copy.

So, my question is can I use a free trial(evaluation copy) to build, deploy, and maintain any type(e.g. commercial, open-source, private, etc.) of application(basically anything like to learn, develop, test, etc. applications),
or do I have to purchase a License to do so from day 1?

I also referred to these:
1. https://intellij-support.jetbrains.com/hc/en-us/community/posts/206703389/comments/207657559
2. https://intellij-support.jetbrains.com/hc/en-us/community/posts/360010617619/comments/360003058059