The Samsung Galaxy S (the top range) sells between 25 to 35 million units per year.

Sure, it's not iPhones number, which are around 8 to 9 times higher but Samsung has to compete in a huge Android ecosystem, whereas the iOS one has only one offering series per year.

The Galaxy S has always been a very solid product line.

I think both ecosystems most often have people switching when the other side has something new. I suspect this foldable is coming in under the expected price of the new iPhone fold and is there to make sure people have a flagship-priced option if they get foldable mania. Very few of these products are trying to steal people away (the rare exceptions might be the previous gen high-end foldable phones that are android-only so far).