At least in regards to competing against hundreds of applicants, I think that's driven by how easy it is to submit a job application now, and by the fact that so many roles are remote. I'm job searching as well at the moment, and a friend I talked to said he had genuinely applied to at least 1000 jobs, in basically any city in the country, before landing the role he has now. Said he submitted 20 applications/day, 5 days a week for 6 months. That kind of math can explain why so many roles have 1000+ other applicants.