Chinese apps, but not only available in the chinese market, you could get them in Europe or in the US as well.
Sure, they were removed or fixed (after several days and they were available for months) but I'm talking about good practices. Because...**** happens!
Say you are browsing in safari on the mac and you get this pop up:
"your mac is infected! please insert the administrator password to scan your system and remove viruses".
What do you do? You laugh and close the window (and avoid that website in the future). That's because most users know very well that safari isn't supposed to ask for our password while browsing the internet. Apple doesn't have to fix this problem because the problem is solved by itself.
On iOS...meh. Sometimes i have wondered: "is this a legitimate password request or do I have some infected apps that work in the background and throw a password request in my home screen?" Especially when things are buggy and the password gets asked for three times!
In the end, you have a bad practice + bugs that make things worse. And these things add up to users thinking:
"Well, sometimes iOS we'll ask me again and again for a password and I'll just type it. It's how it works, it's normal".
This is dangerous!
It's a security problem waiting to happen.
Modal dialogs with password requests are widely considered bad programming when not linked to a specific an unambiguous user action.