If you cheer 100 bits or more your message will be read out loud (TTS). Also if you feel more comfortable you can donate through PayPal, you can access it on the image above.
It's worth noting that it's cheaper to buy Twitch Bits on PC rather than on mobile devices.
Remember that all donations are non required, they're totally optional, and only do it if you financially can and also if you want to do it. If after reading all of this you still want to donate, then thank you very much!