The original idea of open source or rather free software is to bmactually "own" the code in a way that you can modify it to your needs. Guess this is not the case here, then. But I guess also most of android falls in that category that by now. I guess we should be using better,more attributes when describing open source
"Free software" has always been a misleading term, unfortunately. Maybe calling it "Freedom software" instead would be clearer.
But when you conflate free software with open source, you get confused people cheerleading their own abuse. Android is probably the worst offender here. Google Chrome, VSCode are others that come to mind.
The idea of free software, yes, is to own the code in a way that you can modify it to your needs. The idea of "open source" as a mantra is to confuse and muddle the ideas of free software in order to subvert the ideologists in that camp into supporting and furthering the goals of billionaire corporations. "Open source" as a calling card is intended to kill free software.
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There's at least:
source available - whether you can read the code
open source - whether you can run (a modified version of) the code on some piece of hardware you own
open hardware - whether the hardware they sell you lets you run modified versions of their code
open contribution - whether they want your modifications
free software - whether your modifications have to be open source too
If it's at least source available, it can have any combination of these.