Hatunen writes:

Again you display your actual lack of knowledge and willingness
to display it in public. First, there is no FAR prohibiting the
demonstration or practice of doing spins.

Spins must be permitted for the aircraft, and regulations permit them (and
other aerobatic maneuvers) only under certain conditions. In this case, the
Cessna 150 may be spun only after certain modifications are made (since 2009),
in part to prevent maximum rudder travel from interfering with the elevators.
Yes, I have the AD in front of me.

However, the video was uploaded in 2007, and the aircraft has a Canadian
registration number, so this might not apply to the pilot in question.

There's still the question of reckless and careless operation, but if he was
in Canada, that might not apply. In general, one must question the wisdom of a
pilot who executes aerobatic maneuvers in an aircraft not designed for that
purpose. Here again, this has parallels in the world of automobiles: executing
extreme maneuvers in an automobile not designed for such maneuvers is reckless
and careless.