I so often can’t stand e.g. important privacy toggles being hidden deep in settings, dark patterns that obfuscate permitted but unprofitable behavior - so you’d think I’d be with you on this 100%.
And yet…
If they had said "we don't recommend you install this"
, grandma would hit OK without reading it.
For every dollar someone has paid tech support to help them install a desired app from an unidentified developer, I’d bet ten dollars have been saved from others not being able to install some spyware. Maybe that murky little dialogue box is good enough for the lowest common denominators that it outweighs the annoyance for us nerds? (Our small cost being we’re required to Searx once for the solution to learn how to bypass it)