I'm not familiar with any convictions for non-compliance with either the Ontario or the federal registry.
I can tell you the penalty structure for the federal registry: a first offence is a summary conviction offence, which carries a maximum of up to six months' incarceration or a $10,000 fine; and second or subsequent offences are hybrid offences, punishable by up to two years' incarceration, or again up to $10,000 as a fine.
But I'm not aware of convictions for non-compliance. Perhaps Mr. Hoover is.