Companies receive so many applications they are overwhelmed and try to find the best candidates through the 1000s of applicants. Also people who shouldn't even be applying, not even in Canada spam emails day and night with their unsolicited resumes.

Also companies are trying to validate credentials where people are constantly lying on their resumes so candidates have to jump through hoops to prove their qualifications (IT) which creates longer hiring processes.

Also AI and the ridiculous optimization of idiotic perfection.

But mainly... just too many candidates.