This stuff looks much more to me like "fuck the user" than anything else. I am 100% convinced there is a cult of evil bastards at Microsoft, et. al. that is hellbent on making everyone's UI/UX as janky as possible.
I think this because our company recently enforced a 2 year mail deletion policy on all mailboxes for "legal reasons." Which were "we don't want stuff to show up in discovery if we get sued."
Streaming services like Netflix and Disney Plus use these APIs to protect their content as well.
I use a setup like this frequently for work to demo our Android TV based apps with full content even though it all has DRM applied. Always leads to a "how did you get this footage" line of questioning for anyone who knows that we use DRM.
It is essentially like a watermark in a PDF. It can be trivially defeated, but that isn't the point.