I've just installed the intellij-idea-community-edition package and upon opening Intellij it showed me the "JETBRAINS USER AGREEMENT". On it, one can read:

(B) You may not:
(i) Rent, lease, reproduce, modify, adapt, create derivative works of, distribute, sell, or transfer the Product(s);

Products is defined as follows.

"Product" means any generally available JetBrains software product identified by JetBrains as an individual developer tool, which is either covered by Toolbox Subscription, or provided perpetually for free. For the avoidance of doubt, the Product is not produced to the specifications of the User nor customized through modification or personalization, and is intended for mass distribution.

I am not fluent in legalese, but it seems that upon accepting this User Agreement I would be relinquishing my rights to free software freedoms number 2 and 3. I opted to decline and uninstall this package.

I would like you to take a look at this and consider whether this package should be removed from Parabola.

Upon inspecting the PKGBUILD one can see that binaries are directly downloaded from Jetbrains' server.

I suspect that accepting this User Agreement won't be mandatory if compiled directly from the source available at https://github.com/JetBrains/intellij-community I will test this later when I find the time.