I can actually see that
We (I'm Irish) may have a different government next year that we have this year, whereas I'm pretty sure Erdogan will still be President of Turkey by then.
Of course whichever shower we elect and whatever their platforms will work together to make sure nothing much changes, especially not corporate tax rates or inward investment programmes, while the Turkish government may drive tanks into your data centre and nationalise them at any instant. You pay your money and take your chances.
Iceland? Volcanoes, redundant routing options, geographic dispersal, availability of sufficient skilled workers, both construction and operations especially? I'd need to see C&W's raw data and idea of what a risk really means before committing (and I'm waiting for my download since before starting this comment, perhaps from a Turkish data centre).