Remember, anything that you spend money on that relates to your content creator business can be deducted.
It's the same set up as uber and Lyft drivers, they are not considered employees but sole proprietors or 3rd party contractors.
Remember, OnlyFans Content Creators are business owners.
Fundamentally, most verbal agreements are legally valid as long as they meet all the requirements for a contract.
Promoting your account Promotional Campaigns lets you run promotions by offering fans a discounted subscription.
Make sure you save your receipts for all of these deductions as well.