Although the Canadian prime minister and Quebec premier both condemned Bissonnette's actions as a terrorist attack, charges of terrorism were not brought; according to Canadian legal experts, in the Canadian Criminal Code, the offence of terrorism requires not only acts of violence, but usually also collaboration with a terrorist group, which would be difficult to prove for a single gunman. - Source

In the VICE article:

On February 21, Hang-Kam Annie Chiu was walking in north Toronto when she was viciously attacked by a man with a hammer, killing her. That same night, Pakistan-born Saad Akhtar, 30, would surrender at a nearby police station. Akhtar was arrested and charged with first-degree murder for the death of Chiu.

On February 25, Toronto police and the RCMP said they found evidence that led them to believe Chui's alleged homicide “may have been a terrorist-related offence.” Police updated Akhtar's charges to include terrorist activity...

Carvin says, in a legal sense, it can be easier to prove someone has perpetrated a crime on behalf of ISIS because the group has leaders and books and speeches, but it’s a little more difficult in the far-right ecosystem. Many within the far-right don't have a uniform ideology and the groups that exist within it are extremely fractious. ... [T]he judge ruled 83.2 does not apply to "lone wolf terrorists.”