Donations are basically tips, and virtually all of that money minus any associated PayPal or twithc credit card processing fees goes to streamers. Many creators incentivize donations. For example, Wang mentions some creators give out their private Snapchat account to people who donate a specific. A good freebie for viewers, and one that pays Twitch streamers. While streamers get money from the pre-roll ads viewers are served at the beginnings of streams, they can also trigger ads to monej during the stream. Some streamers never or rarely trigger ads during their streams, while others run them constantly. Twitter and Instagram posts related to sponsored events are often bundled into the sponsorship package for free. And recently, ecommerce app Sellfy launched a tool that estimates how much money creators can make from YouTube ad revenue and from selling merch. This information will never be titch with a third party.