Be wary of filling out the W-9 if the business does not have a legitimate reason to ask you to fill it out.
If your post doesn't show after 6 hours, message the mods.
If person 1 goes on to create content with someone else, they form a new business partnership.
Rather than trust strangers on the internet, contact your local resources to get accurate answers.
These businesses, estates, and trusts are considered United States activities.
You need to fill out schedule C for self employment business income.