I'd argue that any organism is inherently open source, just not necessarily free and open source.

By that logic you could argue that software is inherently open source.

As the reverse engineering communities will be glad to tell you, software basically is open source. It must eventually be decoded into instructions to run on a processor, and while it's not impossible to fully sign / encrypt the binary blobs before they are run, it is practically not worried about for most applications. Without using specialized hardware, you can at best obfuscate your code, but you cannot make it impossible to eventually disassemble and understand.

Assume your code will be disassembled at some point by a bad actor. Don't assume that any code distributed to a client is safe or trustworthy, and expect that any data, methods, or secrets contained in that code are now public knowledge. To secure your environment systems under any other assumption is a dangerous falsehood.

If it's been baked the source is wrecked, so not really.

Ending a bash script in rm $1 doesn't magically make it not open source, just inherently self-destructive.