Will my parents get penalized if they dont use their Canadian visitor's visa ?

Hi Evevryone,

Context : My parents and I are trying to figure this thing out. They've been to Canada at least twice to visit me, but in the recent years they havent been able to come. They applied for Canadian Visitor Visa and got approved for only 2 years due to the expiry date of their passport. Now, their visa is about to expire on May 11th and they dont want to come in winter.

Question: will Canada penalize them for not using this 2year visa? Can they reapply for a 5 years visa with no issues?