Same thing. Google owns both Android and the Linux Terminal app. Some combination of Google's OS and Google's app causes the app to crash or be crashed in the background. That's something that Google needs to fix regardless of where the bug lies.
Not if it's not crashing at all and is just a fundamental difference between Android's memory management and what the Debian guest is expecting (which is no RAM management at all)
OOM is only triggered when you actually run out of virtual memory. With modern phones that shouldn't normally happen unless you're doing something silly like compiling a web browser.
