Thanks Ira.

Ok, I have no interest in using another ios app but maybe I should try that?

Still totally lost.

You are saying despite that email of which they (this one guy) put all the blame onto Apple for these hundred of folders being ridiculously expanded per force.

So fastmail is wrong, not Apple doing that it's Fastmail, even though that guys reply says Apple is the culprit?

There is one guy there I trust more at Fastmail, I'll see if I can get him into the picture.