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.
“Bescheissen” is not as vulgar as you might think, even if it contains Scheisse (shit).
A more literal translation would be “little Good Lords cheat”. The “*le” at the end is a local (South German) dialect thing, a diminutive suffix meaning “little”, just like “doggy” means “little dog”.