Hi! I'd like to confirm whether a project can run on the Hobby plan under the fair use guidelines.

I'm a freelance developer, and a client is paying me to build the site. It's a website for a small local online streaming channel. The videos are YouTube embeds. The site shows sponsor logos that link to their websites, and has a section inviting businesses to advertise with the channel. My client sells and collects sponsorships outside the site. There are no payments on the site and no ad networks like AdSense. My questions:

Can this site run in production on Hobby, given that sponsorships are handled outside it? Can I use Hobby just for a preview link, so the client can review the site during development? If Hobby isn't allowed, is one Pro seat (US$20/month) enough, and should the account be mine or my client's? Thanks!