The basic software like the Intellij Community Edition is also fully open source. (And it’s not actually basic at all. It’s a great full featured IDE)

Basically you’re only paying for their support/updates and for specific language and toolkit support, which makes sense to me. They need to pay their staff somehow.

It’s not comparable to Adobe or other crappy manufacturers where you own nothing.

They’re pretty much the same. Use docker documentation for learning, but actually use podman, because it’s nicer to use (doesn’t require root, easier to install on many Linux distributions).

I don’t believe this is true, a nickname or online account works completely fine for attribution if nothing else is given.