This is a good article from Bloomberg:
“ It is important to note that transactions for personal gifts, charitable contributions, and reimbursements are specifically excluded from Form 1099-K reporting. Most TPSOs will likely attempt to identify such transactions based on their user agreements, which generally specify whether the user will be using the website for personal or commercial transactions. So, while a pool maintenance company that receives payments for its services through a cash app may receive Forms 1099-K in the future, friends sending money to reimburse one of them for theater tickets purchased for a group should not. This is because the pool company should have a commercial agreement while the friends should use personal agreements when signing up for the app.”
https://news.bloombergtax.com/tax-insights-and-commentary/new-form-1099-reporting-coming-in-2022
