Hello, Concerned with privacy using Microsoft products"
Welcome to Microsoft Community.
We understand the inconvenience you have encountered with the Edge browser on IOS. After testing and inquiries, Microsoft Edge on iPhone does not provide an option to disable autoplay.
However, Microsoft is always updating its software and adding new features, so this may change in the future. You can submit this suggestion to the development team through Feedback in the Edge app, and I helped you submit it. Or you can try submitting feedback with friends around you. If more people work on this, they will notice it faster.
Best regards,
Chandy |Microsoft Community Support Specialist