I don't know the rules but maybe they wanted to keep their UK citizenship? Edit: okay I actually read a bit of what is going on. They have zero income so can't

I don't know the rules but maybe they wanted to keep their UK citizenship? Edit: okay I actually read a bit of what is going on. They have zero income so can't stay. In reality they did have an income but didn't declare it to avoid taxes. No-one to blame but themselves in most cases it seems.