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I deleted Brave browser . It does not support video codecs for Youtube

I've had no problems with YouTube and Brave. In fact in November they started supporting sending BAT directly to YouTube channel publishers. Are you on Linux?

No. I am on Android.

Can't say I've ever noticed YT problems on my phone - tried it just now with m.youtube.com and they all played just fine. Maybe there is something funky about embedded videos vs. on the site directly. Or maybe it's an Android version problem.

I have an old weak tablet.

Using Brave as well. I found lots of websites detecting ad-blocker and wouldn't let read articles without white listing (such as Forbes). Brave gets by them no problem.