Re: How is this not fraud?
"Same DWP who sanction people for failing to turn up for an interview when they are too ill to leave their house."
They don't. As long as you let them know, preferably beforehand, but at least after the fact.
It is practically impossible to get yourself sanctioned without deserving it - 99% of sanctions are for physical attacks on jobcentre staff.
That said, the basic concept of 'sanctions' is idiotic.