iphone 15 video streaming quality

YouTube is not an Apple Product. Contact the app developer here --> App Support or YouTube Help - Google Support

If you encounter any challenges with third-party applications, the best course of action is to directly contact the app developer for further assistance. Here's a brief guide on how to do it:

1. Identify the app developer.
2. Visit their website or app store listing.
3. Look for their contact information or support channels.
4. Clearly describe the issue you are facing.
5. Provide any necessary information they may need.
6. Follow their instructions and provide feedback.
7. Be patient and follow up if needed.

By reaching out to the app developer, you increase your chances of receiving accurate and personalized support for the challenges you're experiencing. To contact an App developer --> How to contact an app developer - Apple Support

If your iPhone 15 has a poor display quality than your iPhone 8 then take the iPhone 15 to the store from where you bought it and give it back to them.

See the comparison below.

If your iPhone 15 has a poor display quality than your iPhone 8 then take the iPhone 15 to the store from where you bought and give it back to them.

I agree, videos on Instagram, FB, X are a bit blurry. There is a noticeable difference.