for what it's worth, a while ago my browser was also hijacked to a web site called badoink.com. it was a website offering an app to view explicit adult material.
the page carefully mimicked the apple app store design. the price was slightly higher than most apps in the app store, but otherwise, it looked exactly like the apple app store, right down to the layout, colours, and fonts. it even had some "reviews" posted.
the fact that i was hijacked (via a hacked web host), and that it was a deliberately deceptive setup, and i was being offered hardcore material (in exchange for my credit card), leads me to question their business ethics. i cannot comment on whether the offer was legitimate, because i didn't buy it.
yammv.
ps. for the people who glibly claim that there is no malware on ios, note that even though nothing was actually loaded onto my device(s), i consider an attempt to obtain my credit card information to be a serious problem. (plus, the misguided advice of those who told me to "fix" this by reloading the ios device, would have wasted many hours of my life, and risked the loss of my data, which is also not a good outcome.)