The short answer, no! You can send anyone a public link that allows them to view, upload, and download assets all without an account (and at no cost to you!) We see a ton of teams use this for content collection and distribution. For example, a team needs to collect all of the photos and videos from a shoot from multiple photographers. Shoot them a link with only upload permissions, and they can upload directly into the Air board you shared! No more drive links, wetransfers, or box accounts are needed!
You can create share links that make the assets accessible without an account. You can control permissions to prevent a user from taking unnecessary actions.
You can also share entire boards for public viewing, where you can control what permissions the link/email gives its recipient.