Sounds a bit like trying to transfer my own money to myself at the bank. I.e. it seems designed to prevent old people getting scammed.
Yes! That is because banking malware is specifically what is being targeted here: https://android-developers.googleblog.com/2026/03/android-de...
That's exactly what this is: Google is trying to prevent tech illiterate users from installing malware.
(Or at least, that's their take on this. You can choose to read between the lines, or not, as to whether they have other motivations also.)