As other posters have already commented spinning should be part of the ppl syllabus.
Both UK and USA saw a reduction in spin fatalities when it was dropped from the syllabus.
I'd argue strongly that it should be in the CPL syllabus - and done properly rather than the "quick see and let's not even bother with a parachute" done in most instructors courses. But I'd leave it out of the PPL syllabus beyond the current "understand and avoid" that's there.
G