Some states have individual rights to publicity, and you should plan on being sued by the celebrity in one of those states.

Bullying in the business world is called competition. Nothing you posted gives rise to any legal claim, so you need to toughen up.

Yes, you can. Remember, IP created by an employee belongs to the company. IP created by an independent contractor, and I suspect a volunteer would...

Plan on paying USA taxes for a number of different reasons, the biggest of which is that you almost certainly will have a bank account in the USA....

No, that would be "claim splitting" and probably "res judicata".

You make a lot of assumptions, which I don't find to be accurate. Since 1) the advent of virtual meetings, and 2) since covid, etc. face to face...

A CEO/President can also be the CFO/Treasurer of a for-profit or not for profit, unless forbidden by the bylaws. The powers and duties of each...

SEO probably refers to Search Engine Optimization. It makes your name/domain appear near the top of a page like "Google" rather than lower down.

You could solve the problem by making the seller ABC dba DEF. Then the check could be deposited into the DEF bank account.

The "strength" of a domain name is linked to a registered trademark, not a "tradename" (e.g. name of company, or DBA).