https://about.fb.com/news/2020/08/paid-online-events/
> We asked Apple to reduce its 30% App Store tax or allow us to offer Facebook Pay so we could absorb all costs for businesses struggling during COVID-19. Unfortunately, they dismissed both our requests and SMBs will only be paid 70% of their hard-earned revenue. While Facebook is waiving fees for paid online events we will make other fees clear in the product.