You can control whether the twitter videos and GIFs play as soon as you scroll through your timeline. If you are on the Twitter app, go to the Settings and privacy. Then in the General section, choose Data usage. There you can adjust the autoplay setting and personalize it. This setting is the same for Android and iOS.
If you are using the twitter website from a browser, it can be adjusted as well. Just go to Settings and privacy, and then click on Accessibility, display and languages and select data usage. There you can adjust the mobile version as well.