So it does violate some core rules of both FS an OS. Also the text is so full of legal holes which makes it useless in it's goal too. It only prevents good-intent individuals from contributing and acts as a tool in hand of big evil corpurates.
No. It's not. It's just a proprietary source-available software. The license is neither Free nor Open.
Only if it was Free Software or at least OpenSource…
From a software engineering POV Photoshop is a bad software (against unix philosophy) and no Free Software wants to be a bad software, so forget about feature parity and use different apps for different things that mistakenly all done by Photoshop.
No. It's not Open source at all!
From Open source definition: "The license must not restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business, or from being used for genetic research."
Source: https://opensource.org/osd
Who uses WhatsApp anyway?
It will periodically overwrite user's preference to the ones dictated by Microsoft
Just wait for a bit
Not all of them. You can look at Rojava for example
What is does is stupid. You always want to stream the media, not mirror your screen!