If there's no mention of salary range in the job ad, I wouldn't even bother applying. The salary is probably paid in credits, which can be used to buy images and illustrations through them...

The headline says "Vendor" so I don't think there will be a salary.

This probably means they're looking to have people shoot on spec to their briefs and they will pay for whatever they accept. So possibly the "vendor" does all the work and it then told Canva doesn't like the results and so doesn't "select" anything.

If they paid contributors better they might get more supply, but I suspect all the agencies will run into this problem. They don't pay well, so lots of contributors stop uploading new stuff as there's so little money in it.

Wholly owned content solves the royalty problem, but they won't get regular supplies of "trendy, relevant, diverse, and locale-specific" content if they select only a few and pay peanuts.

If anyone gives this a try, it'd be great if you'd report back here how it went

Edited to add: If you look at the end of this Freelance job posting, they mention candidates should supply their hourly rate. In other words, even though this is Freelance and a Vendor, not employee, setup, they are planning to pay designers for this work. That language isn't in the photographer listings

https://www.canva.com/careers/jobs/korea-freelance-graphic-designers-korea/

Interesting.

a larger concern is the increasing ability of CGI to create realistic images w/o using models allowing near real-time response to changing demands.